A013950 Start with 1, apply 1->12, 21->21, 22->21, 2->2 (for final 2); a(n) = length of n-th term.

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

Offset

1,2

Links

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

Crossrefs

Cf. A013949.

Sequence in context: A001935 A286141 A007604 * A350842 A018550 A248475

Adjacent sequences: A013947 A013948 A013949 * A013951 A013952 A013953

Keyword

nonn

Author

Clark Kimberling

Status

approved