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A086896
a(n) = (1/4!)*(A000522(4*n) + 6*A000522(2*n) + 8*A000522(n) + 9).
1
1, 5, 4585, 54253051, 2369751675473, 275554721637802801, 70273067330330423607145, 34532185286124210261237875495, 29802657189336638372743189077264481, 42132612521708992400294404621323425841373, 92411987000615635571109725778868157237084881001
OFFSET
0,2
LINKS
PROG
(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
CROSSREFS
Sequence in context: A024074 A276238 A357125 * A177503 A072021 A196627
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Aug 22 2003
EXTENSIONS
Terms a(9) and beyond from Andrew Howroyd, Jan 27 2020
STATUS
approved