A107721 Column 1 of triangle A107719.

1, 2, 13, 131, 1741, 28451, 549757, 12247211, 308953453, 8706012827, 271093643293, 9245857326635, 342832527086797, 13733511532751099, 591127774090746493, 27209560375187822795, 1333804962202136755501

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Prog

(PARI)

Crossrefs

Cf. A107717, A107719.

Sequence in context: A351299 A215624 A247365 * A085882 A041509 A079165

Adjacent sequences: A107718 A107719 A107720 * A107722 A107723 A107724

Keyword

nonn

Author

Paul D. Hanna, May 30 2005

Status

approved