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Search: id:A132618
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| 1, 1, 5, 56, 1020, 26015, 855478, 34461260, 1642995124, 90456911140, 5646312067585, 393937815588880, 30374808071994000, 2564601377235725520, 235302361169390146650, 23309583579201438877060
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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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PROGRAM
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(PARI) {a(n)=local(A=vector(n+1), p); A[1]=1; for(j=1, n-1, p=(n+1)*n-(n-j+1)*(n-j); 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, A132617; A132619.
Sequence in context: A073563 A006658 A006293 this_sequence A060080 A076455 A000362
Adjacent sequences: A132615 A132616 A132617 this_sequence A132619 A132620 A132621
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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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