A126466 Column 0 of triangle A126465.

1, 1, 3, 33, 855, 40475, 3039204, 331630320, 49563943161, 9722245517970, 2423526680920125, 748560249534719259, 280702726068079355157, 125661789748507921799800, 66215986172320048509110050

Offset: 0

Author

Paul D. Hanna, Dec 27 2006

Keywords

• nonn

Crossrefs

Cf. A126465, A126467, A126468; A126469 (row sums).

Programs

PARI

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