A144888 Second column (m=2) of triangle A144886 (S1hat(4)).

1, 4, 36, 200, 1720, 12480, 118560, 1081920, 11793600, 131443200, 1658764800, 21990528000, 319711795200, 4922394624000, 81508654080000, 1428114530304000, 26582538673152000, 521466739605504000, 10779099461222400000, 233753593186713600000, 5310546788872765440000

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Formula

a(n) = A144886(n+2,2), n>=0.

Crossrefs

Cf. A144886, A001715 (first column), A144889 (third column).

Sequence in context: A263420 A302946 A220436 * A291643 A054773 A074434

Adjacent sequences: A144885 A144886 A144887 * A144889 A144890 A144891

Keyword

nonn,easy

Author

Wolfdieter Lang, Oct 09 2008

Status

approved