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A013950 Start with 1, apply 1->12, 21->21, 22->21, 2->2 (for final 2); a(n) = length of n-th term. 0
1, 2, 3, 4, 6, 9, 12, 16, 22, 31, 42, 56, 76, 105, 142, 190, 258, 353, 476, 640, 870, 1183, 1594, 2152, 2924, 3961, 5342, 7230, 9810, 13265, 17916, 24272, 32886, 44447, 60106, 81432, 110220, 149001, 201646, 273086, 369442, 499649, 676380, 915616, 1238534 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..45.

CROSSREFS

Cf. A013949.

Sequence in context: A001935 A286141 A007604 * A018550 A248475 A035952

Adjacent sequences:  A013947 A013948 A013949 * A013951 A013952 A013953

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified March 22 04:32 EDT 2019. Contains 321406 sequences. (Running on oeis4.)