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A132616
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Column 0 of triangle A132615.
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4
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1, 1, 1, 6, 80, 1666, 47232, 1694704, 73552752, 3744491970, 218684051648, 14406896813608, 1056681951098592, 85379764462169382, 7534286318509305600, 720884741940337283712, 74330131862002429961712
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OFFSET
| 0,4
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COMMENTS
| 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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PROG
| (PARI) {a(n)=local(A=vector(n+1), p); A[1]=1; for(j=1, n-1, p=(n-1)*(n-2)-(n-j-1)*(n-j-2); 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
| Cf. A132615 (triangle); other columns: A132617, A132618; A132619.
Sequence in context: A132547 A167570 A177776 * A077393 A002676 A052348
Adjacent sequences: A132613 A132614 A132615 * A132617 A132618 A132619
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Aug 24 2007
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