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Search: id:A125794
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| 1, 5, 25, 165, 1625, 25509, 664665, 29559717, 2290267225, 314039061413, 77160820913241, 34317392762489765, 27859502236825957465, 41575811106337540656037, 114746581654195790543205465
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OFFSET
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0,2
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COMMENT
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Triangle A078121 shifts left one column under matrix square and is related to partitions into powers of 2.
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PROGRAM
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(PARI) {a(n)=local(p=4, q=2, A=Mat(1), B); for(m=1, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i|j==1, B[i, j]=1, B[i, j]=(A^q)[i-1, j-1]); )); A=B); return(sum(c=0, n, (A^p)[n+1, c+1]))}
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CROSSREFS
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Cf. A125790, A078121; columns: A002577, A125792, A125793, A125795, A125796; diagonals: A125797, A125798.
Sequence in context: A137963 A144887 A134007 this_sequence A109793 A112242 A035341
Adjacent sequences: A125791 A125792 A125793 this_sequence A125795 A125796 A125797
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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), Dec 10 2006
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