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Search: id:A132617
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| 1, 1, 3, 25, 378, 8460, 252087, 9392890, 420142350, 21927528948, 1307723670020, 87712176219801, 6534001434836758, 535159878432210000, 47792303301224799288, 4621416976280491118910, 481020078381722064175750
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OFFSET
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0,3
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COMMENT
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Triangle T=A132615 is generated by odd matrix powers of itself such that row n+1 of T = row n of T^(2n-1) with appended '1' for n>=0 with T(0,0)=1.
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FORMULA
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a(n) is divisible by 2n-1 for n>0; a(n)/(2n-1) = A132619(n).
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PROGRAM
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(PARI) {a(n)=local(A=vector(n+1), p); A[1]=1; for(j=1, n-1, p=n*(n-1)-(n-j)*(n-j-1); A=Vec((Polrev(A)+x*O(x^p))/(1-x))); A=Vec((Polrev(A)+x*O(x^p))/(1-x)); A[p+1]}
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CROSSREFS
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Cf. A132615 (triangle); other columns: A132616, A132618; A132619.
Sequence in context: A129506 A143139 A012481 this_sequence A143925 A074708 A009843
Adjacent sequences: A132614 A132615 A132616 this_sequence A132618 A132619 A132620
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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), Aug 24 2007
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