|
Search: id:A126467
|
|
| |
|
| 1, 1, 6, 105, 3710, 219625, 19545316, 2437990653, 405899413380, 87002614878795, 23351252019790310, 7676367378822833691, 3035533054438876836390, 1422385798272704860377055, 779768824083518449340320720
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
PROGRAM
|
(PARI) {a(n)=local(M=matrix(n+2, n+2, r, c, if(r>=c, binomial((r-1)*r*(r+1)/3!-(c-1)*c*(c+1)/3!, r-c))), N=matrix(n+2, n+2, 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+2, 2]}
|
|
CROSSREFS
|
Cf. A126465, A126466, A126468; A126469 (row sums).
Sequence in context: A033589 A077289 A110342 this_sequence A013294 A013300 A109819
Adjacent sequences: A126464 A126465 A126466 this_sequence A126468 A126469 A126470
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Paul D. Hanna (pauldhanna(AT)juno.com), Dec 27 2006
|
|
|
Search completed in 0.002 seconds
|
