A126453 Row sums of triangle A126450: a(n) = Sum_{k=0..n} C( C(n+2,3) - C(k+2,3) + 1, n-k).

1, 3, 15, 218, 7273, 434654, 40417797, 5369210845, 962496995941, 223528473482380, 65221305164439085, 23343099723197369886, 10052235133879615066675, 5126300310101866339983229

Offset: 0

Author

Paul D. Hanna, Dec 27 2006

Keywords

• nonn

Crossrefs

Cf. A126450; A126451, A126452.

Programs

PARI

a(n)=sum(k=0,n,binomial(binomial(n+2,3)-binomial(k+2,3)+1, n-k))