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Search: id:A134525
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| A134525 |
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Column 2 of triangle T=A134523, also equals column 0 of the matrix power T^6, where column k of T = column 0 of matrix power T^{(k+1)(k+2)/2} for k>=0. |
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+0
4
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| 1, 6, 51, 636, 11406, 284541, 9580386, 424183235, 24153149813, 1735098195632, 154672986360369, 16865030992205590, 2221033362344695926, 349359800218878205297, 64988052594622640286645
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OFFSET
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0,2
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PROGRAM
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(PARI) {a(n)=local(A, B); A=matrix(1, 1); A[1, 1]=1; for(m=2, n+3, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3|j==i|j>m-1, B[i, j]=1, if(j==1, B[i, 1]=1, B[i, j]=(A^(j*(j+1)/2))[i-j+1, 1])); )); A=B); A[n+3, 3]}
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CROSSREFS
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Cf. A134523 (triangle); other columns: A134524, A134526.
Sequence in context: A000405 A113352 A063169 this_sequence A125865 A134276 A125803
Adjacent sequences: A134522 A134523 A134524 this_sequence A134526 A134527 A134528
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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), Nov 15 2007
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