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Search: id:A121425
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A121425 Main diagonal of rectangular table A121424. +0
3
1, 2, 12, 118, 1605, 27816, 585046, 14459138, 410368743, 13146830110, 469123986529, 18447791712945, 792514583941223, 36925394368325295, 1854525584914459755, 99872579714406393286, 5740977285851988017769 (list; graph; listen)
OFFSET

0,2

FORMULA

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).

PROGRAM

(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])}

CROSSREFS

Cf. A121424, A121412.

Sequence in context: A012628 A012623 A009742 this_sequence A132692 A136736 A009546

Adjacent sequences: A121422 A121423 A121424 this_sequence A121426 A121427 A121428

KEYWORD

nonn

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Aug 26 2006

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.


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