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Search: id:A121427
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| 1, 2, 15, 178, 2820, 55410, 1294776, 35003430, 1073540871, 36805249870, 1394346324624, 57831360118800, 2605921998840420, 126757491839620950, 6619466939158637640, 369368127676399990338, 21932876159270004129285
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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 A136737.
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FORMULA
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a(n) = [A121412^(n+1)](n+1,1) for n>=0; i.e., (n+1)-th term of column 1 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+2, 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+2, 2])}
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CROSSREFS
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Cf. A121426, A121412.
Cf. A136737; A121413, A121417, A121422; A136741.
Sequence in context: A153852 A117667 A036080 this_sequence A099709 A052857 A053492
Adjacent sequences: A121424 A121425 A121426 this_sequence A121428 A121429 A121430
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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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