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

Author

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

Keywords

• nonn

Crossrefs

See A132458 for further information.