A126468 Column 2 of triangle A126465.

1, 1, 10, 255, 11935, 879571, 93365328, 13464554610, 2531141851260, 601339958510170, 176255315943299736, 62514948119465302825, 26407795709641456484010, 13109371824722841349352160

Offset: 0

Author

Paul D. Hanna, Dec 27 2006

Keywords

• nonn

Crossrefs

Cf. A126465, A126466, A126467; A126469 (row sums).

Programs

PARI

{a(n)=local(M=matrix(n+3,n+3,r,c,if(r>=c,binomial((r-1)*r*(r+1)/3!-(c-1)*c*(c+1)/3!,r-c))), N=matrix(n+3,n+3,r,c,if(r>=c,binomial((r-1)*r*(r+1)/3!-(c-1)*c*(c+1)/3!+1,r-c)))); (N*M^-1)[n+3,3]}