A126466 Column 0 of triangle A126465.

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

Offset

0,3

Links

Table of n, a(n) for n=0..14.

Prog

(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]}

Crossrefs

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

Sequence in context: A289695 A124432 A234715 * A002112 A055549 A086894

Adjacent sequences: A126463 A126464 A126465 * A126467 A126468 A126469

Keyword

nonn

Author

Paul D. Hanna, Dec 27 2006

Status

approved