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

0,2

Links

Table of n, a(n) for n=0..13.

Prog

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

Crossrefs

Cf. A126450; A126451, A126452.

Sequence in context: A145272 A264705 A117820 * A007081 A126455 A136466

Adjacent sequences: A126450 A126451 A126452 * A126454 A126455 A126456

Keyword

nonn

Author

Paul D. Hanna, Dec 27 2006

Status

approved