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Search: id:A113376
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| 1, 8, 84, 1296, 27850, 784146, 27630378, 1177691946, 59169833470, 3434258845248, 226594550768662, 16775755397765720, 1378646430074005827, 124636321499378130839, 12300850874338422058685
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OFFSET
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0,2
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FORMULA
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A113374 equals the matrix square of A113370, which has the property: column k of A113370^2 = column 0 of A113381^(3*k+1) for k>=0.
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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==i|j>m-1, B[i, j]=1, if(j==1, B[i, 1]=1, B[i, j]=(A^(3*j-2))[i-j+1, 1])); )); A=B); (A^2)[n+2, 2]}
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CROSSREFS
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Cf. A113374, A113375 (column 0), A113377 (column 2).
Sequence in context: A048665 A005797 A052659 this_sequence A093103 A131812 A035133
Adjacent sequences: A113373 A113374 A113375 this_sequence A113377 A113378 A113379
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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 14 2005
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