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A107721
Column 1 of triangle A107719.
3
1, 2, 13, 131, 1741, 28451, 549757, 12247211, 308953453, 8706012827, 271093643293, 9245857326635, 342832527086797, 13733511532751099, 591127774090746493, 27209560375187822795, 1333804962202136755501
OFFSET
0,2
PROG
(PARI)
CROSSREFS
Sequence in context: A351299 A215624 A247365 * A085882 A041509 A079165
KEYWORD
nonn
AUTHOR
Paul D. Hanna, May 30 2005
STATUS
approved