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Search: id:A132693
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| 1, 1, -3, 22, -250, 3810, -72492, 1649634, -43626510, 1313526375, -44332221175, 1657043432088, -67929461003560, 3029864359322346, -146058681728370600, 7566706624571096610, -419220650458638848514, 24733868801871384287055, -1548237182318766914543100
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OFFSET
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0,3
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COMMENT
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Triangle T=A132690 is generated from negative powers of itself such that row n+1 of T = row n of T^(-n) with appended '1' for n>=0 with T(0,0)=1.
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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-2)))[i-1, j]); )); A=B); return( ((A)[n+3, 3]))}
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CROSSREFS
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Cf. A132690; A132691, A132692, A132694.
Sequence in context: A141356 A052677 A136741 this_sequence A143634 A054595 A054594
Adjacent sequences: A132690 A132691 A132692 this_sequence A132694 A132695 A132696
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KEYWORD
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sign
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Aug 25 2007
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