A086895 a(n) = 1/3!*(A000522(3*n) + 3*A000522(n) + 2).

1, 4, 329, 164410, 217010257, 592437912176, 2900576017215049, 23146596617368286854, 281092269321320392419425, 4933169326589172885999647452, 120172004795712251502939402381001, 3933950748992436265200224114943085394, 168530450086835969601177601081838249796529

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..100

Prog

(PARI) \\ here b(n) is A000522(n).
b(n)={sum(k=0, n, binomial(n, k)*k!)}
a(n)={(b(3*n) + 3*b(n) + 2) / 6} \\ Andrew Howroyd, Jan 27 2020

Crossrefs

Cf. A000522, A008290.

Sequence in context: A075768 A378720 A135442 * A293241 A220646 A352657

Adjacent sequences: A086892 A086893 A086894 * A086896 A086897 A086898

Keyword

nonn

Author

Vladeta Jovovic, Aug 22 2003

Extensions

Terms a(11) and beyond from Andrew Howroyd, Jan 27 2020

Status

approved