A132466 Let df(n,k) = Product_{i=0..k-1} (n-i) be the descending factorial and let P(m,n) = df(n-1,m-1)^2*(2*n-m)/((m-1)!*m!). Sequence gives P(8,n).

0, 0, 0, 0, 0, 0, 0, 1, 80, 1944, 25200, 217800, 1411344, 7361640, 32391216, 124227675, 425339200, 1323786464, 3797876160, 10155802176, 25539739200, 60844672800, 138154965696, 300509773245, 628886888784, 1270898695000, 2488029830000, 4731583685400, 8762192010000

Offset

1,9

Links

Table of n, a(n) for n=1..29.

Crossrefs

See A132458 for further information.

Sequence in context: A173782 A332580 A333546 * A277764 A328875 A154307

Adjacent sequences: A132463 A132464 A132465 * A132467 A132468 A132469

Keyword

nonn

Author

Ottavio D'Antona (dantona(AT)dico.unimi.it), Oct 31 2007

Status

approved