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Search: id:A102585
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| A102585 |
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Column 0 of triangular matrix A102583, in which row n is formed from the first differences of row (n-1) of its inverse matrix square. |
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+0
3
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| 1, 1, -2, 13, -209, 7558, -584837, 94047241, -30883147262, 20492965038853, -27310366246742669, 72841632366094705678, -388104936993411191934437, 4126997257143980587638461521, -87552095605182502304219090669762, 3705151846765308253776294449404299133
(list; graph; listen)
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OFFSET
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0,3
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PROGRAM
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(PARI) {a(n)=local(A=Mat(1), B); for(m=2, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, if(j==1, B[i, j]=(A^-2)[i-1, 1], B[i, j]=(A^-2)[i-1, j]-(A^-2)[i-1, j-1])); )); A=B); return(A[n+1, 1])}
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CROSSREFS
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Cf. A102583, A102586.
Sequence in context: A003507 A003085 A053598 this_sequence A078702 A069569 A015196
Adjacent sequences: A102582 A102583 A102584 this_sequence A102586 A102587 A102588
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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), Jan 22 2005
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