From 3 letters to 13 letters, but leaving out the (numerical) definitions:

one

six

ten

two

five

four

nine

zero

eight

fifty

forty

seven

sixty

three

eighty

eleven

ninety

thirty

twelve

twenty

fifteen

seventy

sixteen

eighteen

fifty-one

fifty-six

fifty-two

forty-one

forty-six

forty-two

fourteen

nineteen

sixty-one

sixty-six

sixty-two

thirteen

eighty-one

eighty-six

eighty-two

fifty-five

fifty-four

fifty-nine

forty-five

forty-four

forty-nine

ninety-one

ninety-six

ninety-two

seventeen

sixty-five

sixty-four

sixty-nine

thirty-one

thirty-six

thirty-two

twenty-one

twenty-six

twenty-two

eighty-five

eighty-four

eighty-nine

fifty-eight

fifty-seven

fifty-three

forty-eight

forty-seven

forty-three

ninety-five

ninety-four

ninety-nine

one billion

one hundred

one million

seventy-one

seventy-six

seventy-two

six billion

six hundred

six million

sixty-eight

sixty-seven

sixty-three

ten billion

ten million

thirty-five

thirty-four

thirty-nine

twenty-five

twenty-four

twenty-nine

two billion

two hundred

two million

eighty-eight

eighty-seven

eighty-three

five billion

five hundred

five million

four billion

four hundred

four million

nine billion

nine hundred

nine million

ninety-eight

ninety-seven

ninety-three

one thousand

one trillion

seventy-five

seventy-four

seventy-nine

six thousand

six trillion

ten thousand

ten trillion

thirty-eight

thirty-seven

thirty-three

twenty-eight

twenty-seven

twenty-three

two thousand

two trillion

eight billion

eight hundred

eight million

fifty billion

fifty million

five thousand

five trillion

forty billion

forty million

four thousand

four trillion

nine thousand

nine trillion

one decillion

one nonillion

one octillion

seven billion

seven hundred

seven million

seventy-eight

seventy-seven

seventy-three

six decillion

six nonillion

six octillion

sixty billion

sixty million

ten decillion

ten nonillion

ten octillion

three billion

three hundred

three million

two decillion

two nonillion

two octillion

eight thousand

eight trillion

eighty billion

eighty million

eleven billion

eleven million

fifty thousand

fifty trillion

five decillion

five nonillion

five octillion

forty thousand

forty trillion

four decillion

four nonillion

four octillion

nine decillion

nine nonillion

nine octillion

ninety billion

ninety million

one billion, one

one billion, six

one billion, ten

one billion, two

one centillion

one hundred one

one hundred six

one hundred ten

one hundred two

one million, one

one million, six

one million, ten

one million, two

one septillion

one sextillion

seven thousand

seven trillion

six billion, one

six billion, six

six billion, ten

six billion, two

six centillion

six hundred one

six hundred six

six hundred ten

six hundred two

six million, one

six million, six

six million, ten

six million, two

six septillion

six sextillion

sixty thousand

sixty trillion

ten billion, one

ten billion, six

ten billion, ten

ten billion, two

ten centillion

ten million, one

ten million, six

ten million, ten

ten million, two

ten septillion

ten sextillion

thirty billion

thirty million

three thousand

three trillion

twelve billion

twelve million

twenty billion

twenty million

two billion, one

two billion, six

two billion, ten

two billion, two

two centillion

two hundred one

two hundred six

two hundred ten

two hundred two

two million, one

two million, six

two million, ten

two million, two

two septillion

two sextillion

By *American* English we mean to exclude the conjunctive use of "and". As befits a dictionary, the integers are sorted alphabetically in each letter-count grouping. In such ordering, a word separator (a space or a hyphen) precedes any letter of a longer expression that starts the same. For example, "eight undecillion" precedes "eighteen thousand". The 13-letter entries introduce the comma, which functions to separate differing *10^3n* power regimes. The counts (4, 4, 6, 6, 3, 13, 22, 35, 32, 36, 89) differ from the previous-version terms of A121064 (where numbers were < 10^66) only in the 89 for the 13-letter count. That is because our current number range (< 10^306) allows for "centillion" (of which there are 4) to finally show up. As we go beyond 13 letters, such intrusions increase.

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