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A126467
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Column 1 of triangle A126465.
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4
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1, 1, 6, 105, 3710, 219625, 19545316, 2437990653, 405899413380, 87002614878795, 23351252019790310, 7676367378822833691, 3035533054438876836390, 1422385798272704860377055, 779768824083518449340320720
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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PROG
| (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]}
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CROSSREFS
| Cf. A126465, A126466, A126468; A126469 (row sums).
Sequence in context: A033589 A077289 A110342 * A013294 A013300 A109819
Adjacent sequences: A126464 A126465 A126466 * A126468 A126469 A126470
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Dec 27 2006
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