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Search: id:A132691
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| 1, 1, -1, 5, -43, 527, -8396, 164672, -3835910, 103464895, -3170985454, 108828369497, -4134333957073, 172223139437835, -7805591781504739, 382374360671653989, -20132511625986242785, 1133765691312312723347, -68002260363248096548050
(list; graph; listen)
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OFFSET
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0,4
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PROGRAM
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(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+1, 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+1, 1]))}
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CROSSREFS
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Cf. A132690; A132692, A132693, A132694.
Sequence in context: A093620 A107720 A060053 this_sequence A090470 A052895 A005989
Adjacent sequences: A132688 A132689 A132690 this_sequence A132692 A132693 A132694
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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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