A132465 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(7,n).

0, 0, 0, 0, 0, 0, 1, 63, 1232, 13104, 94500, 518364, 2317392, 8833968, 29630601, 89464375, 247351104, 634542272, 1526183568, 3470399856, 7511688000, 15564217536, 31016698713, 59686024167, 111284511184, 201628350000, 355896440900, 613353440700, 1034083486800

Offset

1,8

Links

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

Crossrefs

See A132458 for further information.

Sequence in context: A258014 A183076 A230660 * A202983 A107319 A243214

Adjacent sequences: A132462 A132463 A132464 * A132466 A132467 A132468

Keyword

nonn

Author

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

Status

approved