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Search: id:A113990
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| 1, 4, 12, 36, 116, 416, 1680, 7656, 39256, 225348, 1439868, 10179116, 79153484, 673262240, 6231517920, 62461031920, 675005395152, 7832909636740, 97238472215564, 1286967352638292, 18102901048062404, 269852768731391808
(list; graph; listen)
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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=Mat(1); for(m=2, n+2, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3|j==1|j==i, B[i, j]=1, B[i, j]=A[i-1, j-1]+(A^2)[i-2, j-1] ); )); A=B); (A^2)[n+2, 2]}
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CROSSREFS
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Cf. A113988, A113989 (column 0), A113991 (column 2), A113992 (column 3).
Adjacent sequences: A113987 A113988 A113989 this_sequence A113991 A113992 A113993
Sequence in context: A052156 A000781 A055395 this_sequence A056383 A052643 A140123
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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 12 2005
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