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Search: id:A121414
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| A121414 |
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Column 2 of triangle A121412, in which row n of T=A121412 equals row (n-1) of T^(n+1) with an appended '1'. |
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+0
8
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| 1, 1, 5, 45, 581, 9730, 199692, 4843125, 135345925, 4278317373, 150818840250, 5863215069621, 249105031449435, 11480173020040450, 570303168053225908, 30375972794764190385, 1726700205634807475115, 104332294453480284687895
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OFFSET
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0,3
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COMMENT
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Also equals column 4 of triangle A101479.
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PROGRAM
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(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+3, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, B[i, j]=(A^i)[i-1, j]); )); A=B); return((A^1)[n+3, 3])}
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CROSSREFS
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Cf. A121412 (triangle); other columns: A101483, A121413, A121415; A101479 (triangle).
Sequence in context: A133305 A062023 A084095 this_sequence A097328 A051539 A007696
Adjacent sequences: A121411 A121412 A121413 this_sequence A121415 A121416 A121417
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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), Aug 22 2006
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