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 A126468 Column 2 of triangle A126465. 4
 1, 1, 10, 255, 11935, 879571, 93365328, 13464554610, 2531141851260, 601339958510170, 176255315943299736, 62514948119465302825, 26407795709641456484010, 13109371824722841349352160 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS PROG (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]} CROSSREFS Cf. A126465, A126466, A126467; A126469 (row sums). Sequence in context: A059166 A100743 A251588 * A336665 A024293 A120268 Adjacent sequences:  A126465 A126466 A126467 * A126469 A126470 A126471 KEYWORD nonn AUTHOR Paul D. Hanna, Dec 27 2006 STATUS approved

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Last modified April 22 19:11 EDT 2021. Contains 343177 sequences. (Running on oeis4.)