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Search: id:A113347
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| 1, 6, 39, 327, 3556, 48659, 812462, 16136404, 373415239, 9900007028, 296557405704, 9921937128500, 367181525916035, 14906571298831661, 659191947156441025, 31558799717042019635, 1626968083690674214906
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OFFSET
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0,2
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COMMENT
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A113345 is the matrix square of A113340.
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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+2, 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^(2*j-1))[i-j+1, 1])); )); A=B); (A^2)[n+2, 2]}
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CROSSREFS
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Cf. A113340, A113345, A113346 (column 0), A113348 (column 2), A113349 (column 3); A113350.
Sequence in context: A137972 A007322 A058191 this_sequence A031972 A124577 A006678
Adjacent sequences: A113344 A113345 A113346 this_sequence A113348 A113349 A113350
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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 08 2005
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