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Search: id:A132694
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| 1, 1, -4, 35, -455, 7735, -161336, 3973212, -112587210, 3603324835, -128433778935, 5042279130343, -216113991649920, 10038333251577820, -502213976534135280, 26920671954736535620, -1539171664433009622090, 93492751831594011076131, -6012423991038631627857900
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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+4, 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+4, 4]))}
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CROSSREFS
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Cf. A132690; A132691, A132692, A132693.
Adjacent sequences: A132691 A132692 A132693 this_sequence A132695 A132696 A132697
Sequence in context: A026304 A104456 A123224 this_sequence A143669 A119391 A005973
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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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