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"and" is used in number names and "-" is counted as a letter (e.g. "twenty-one" has more letters than "seventeen").
Table of n, a(n) for n=1..42.
Sean A. Irvine, Number names for terms in the sequence
Sequence in context: A175820 A127209 A052362 * A071197 A191067 A052363
Adjacent sequences: A001616 A001617 A001618 * A001620 A001621 A001622
N. J. A. Sloane.
Missing terms added by Sean A. Irvine, Oct 04 2012