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Search: id:A113379
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| 1, 3, 15, 136, 1998, 41973, 1166263, 40747561, 1726907675, 86421647389, 5002021986418, 329382745551946, 24351172588548270, 1999205882982496161, 180613538916429940159, 17817366508243503227269
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OFFSET
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0,2
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FORMULA
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A113378 equals the matrix cube of A113370, which has the property: column k of A113370^3 = column 0 of A113389^(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+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^(3*j-2))[i-j+1, 1])); )); A=B); (A^3)[n+1, 1]}
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CROSSREFS
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Cf. A113378, A113370, A113389, A113380 (column 1).
Sequence in context: A030539 A028362 A113723 this_sequence A163949 A005816 A086228
Adjacent sequences: A113376 A113377 A113378 this_sequence A113380 A113381 A113382
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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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