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Search: id:A113346
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| 1, 2, 5, 19, 113, 966, 10958, 156700, 2727794, 56306696, 1350043965, 36979531549, 1141573025172, 39272377323693, 1491452150268436, 62027842189908231, 2805631215820328992, 137199563717151509077, 7215932308408758314447
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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+1, 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+1, 1]}
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CROSSREFS
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Cf. A113340, A113345, A113347 (column 1), A113348 (column 2), A113349 (column 3); A113350.
Sequence in context: A009311 A107882 A089126 this_sequence A054926 A002786 A039719
Adjacent sequences: A113343 A113344 A113345 this_sequence A113347 A113348 A113349
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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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