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Search: id:A126469
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| 1, 2, 5, 41, 972, 44457, 3271312, 352087787, 52098230423, 10141977387056, 2513121624034518, 772525844883337679, 288558785171538716889, 128760943237115947732171, 67665205307818875323789155
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(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)))); sum(k=0, n, (N*M^-1)[n+1, k+1])}
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CROSSREFS
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Cf. A126465, A126466, A126467, A126468.
Sequence in context: A002592 A054553 A009457 this_sequence A054859 A076725 A059917
Adjacent sequences: A126466 A126467 A126468 this_sequence A126470 A126471 A126472
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Dec 27 2006
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