A347985 a(n) = [x^n] (2*n)! * Sum_{k=0..2*n} binomial(x-2*n,k).

1, -3, 131, -8955, 893249, -117408375, 19180128407, -3747886705563, 852713408774513, -221431482383149467, 64629367172619230475, -20945446993569455512155, 7463226827397324296491489, -2899926767958744905966692575

Offset

0,2

Links

Seiichi Manyama, Table of n, a(n) for n = 0..283

Formula

a(n) = A054649(2*n,n).

Prog

(PARI) a(n) = (2*n)!*polcoef(sum(k=n, 2*n, binomial(x-2*n, k)), n);

Crossrefs

Cf. A054649.

Sequence in context: A249379 A139943 A005175 * A082439 A082622 A332113

Adjacent sequences: A347982 A347983 A347984 * A347986 A347987 A347988

Keyword

sign

Author

Seiichi Manyama, Sep 24 2021

Status

approved