A126459 Column 1 of triangle A126457; a(n) = C( C(n+3,3) + 2, n).

1, 6, 66, 1540, 66045, 4582116, 470155077, 66983637864, 12655529067060, 3062465626261470, 923729223066105456, 339813167168828020668, 149762733221010818774320, 77904783726874238769542600

Offset: 0

Author

Paul D. Hanna, Dec 27 2006

Keywords

• nonn

Crossrefs

Cf. A126457, A126458; A126447, A126452, A126456.

Programs

PARI

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