A086896 a(n) = (1/4!)*(A000522(4*n) + 6*A000522(2*n) + 8*A000522(n) + 9).

1, 5, 4585, 54253051, 2369751675473, 275554721637802801, 70273067330330423607145, 34532185286124210261237875495, 29802657189336638372743189077264481, 42132612521708992400294404621323425841373, 92411987000615635571109725778868157237084881001

Offset: 0

Author

Vladeta Jovovic, Aug 22 2003

Keywords

• nonn

Links

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

Crossrefs

Cf. A000522, A008290.

Programs

PARI

\\ here b(n) is A000522.
b(n)={sum(k=0, n, binomial(n, k)*k!)}
a(n)={(b(4*n) + 6*b(2*n) + 8*b(n) + 9) / 24} \\ Andrew Howroyd, Jan 27 2020

Extensions

Terms a(9) and beyond from Andrew Howroyd, Jan 27 2020