A290701 a(n) = Sum_{k=1..n-1} binomial(n, k)*G_n*G_{n-k} where G_n is the n-th Genocchi number (of the first kind).

2, -6, 6, 10, -30, -42, 238, 306, -2790, -3410, 45606, 53898, -993902, -1146810, 27887070, 31605346, -979901046, -1095183522, 42166810390, 46605422010, -2181617832702, -2389390959626, 133636947954126, 145257552124050, -9566483624198150, -10331802314134002

Offset: 2

Author

Seiichi Manyama, Aug 09 2017

Keywords

• sign

Links

• Seiichi Manyama, Table of n, a(n) for n = 2..549
• Wikipedia, Genocchi number

Crossrefs

Cf. A036968.

Formula

a(n) = 2*n*A036968(n-1) + 2*(n-1)*A036968(n).