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Search: id:A121425
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| 1, 2, 12, 118, 1605, 27816, 585046, 14459138, 410368743, 13146830110, 469123986529, 18447791712945, 792514583941223, 36925394368325295, 1854525584914459755, 99872579714406393286, 5740977285851988017769
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OFFSET
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0,2
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COMMENT
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Also main diagonal of square array A136733.
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FORMULA
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a(n) = [A121412^(n+1)](n,0) for n>=0; i.e., (n+1)-th term of column 0 in matrix power A121412^(n+1).
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PROGRAM
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(PARI) {a(n)=local(H=Mat(1), B); for(m=1, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, B[i, j]=(H^i)[i-1, j]); )); H=B); return((H^(n+1))[n+1, 1])}
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CROSSREFS
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Cf. A121424, A121412.
Cf. A136733; A101483, A121418, A121421.
Sequence in context: A012628 A012623 A009742 this_sequence A132692 A009546 A009748
Adjacent sequences: A121422 A121423 A121424 this_sequence A121426 A121427 A121428
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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 26 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Oct 30 2008 at the suggestion of R. J. Mathar
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