A126455 Column 0 of triangle A126454; a(n) = C( C(n+2,3) + 2, n).

1, 3, 15, 220, 7315, 435897, 40475358, 5373200880, 962889794295, 223581013518060, 65230517839369311, 23345156728397937888, 10052806195411162278095, 5126493560257678027274800

Offset: 0

Author

Paul D. Hanna, Dec 27 2006

Keywords

• nonn

Crossrefs

Cf. A126454, A126456; A126446, A126451, A126458.

Programs

Mathematica

Table[Binomial[Binomial[n+2,3]+2,n],{n,0,20}] (* Harvey P. Dale, Dec 08 2018 *)

PARI

a(n)=binomial(n*(n+1)*(n+2)/3!+2, n)