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Search: id:A104031
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| A104031 |
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Column 1 of triangle A104030, which is the matrix inverse of the triangle of pair-wise sums of trinomial coefficients. |
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+0
2
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| 1, -5, 32, -299, 4015, -74080, 1801537, -55855829, 2150565968, -100668835739, 5630336915071, -370807060847872, 28403381397111649, -2503741873703550533, 251652633457563092096, -28608467296650576313259, 3652291148549164761101551, -520296573821474451201241696
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Column 0 of triangle A104030 forms signed Hammersley's polynomial p_n(1) (A006846), offset 1.
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PROGRAM
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(PARI) {a(n)=if(n<0, 0, ((matrix(n+2, n+2, m, j, if(m>=j, polcoeff((1+x+x^2)^(m-1)+O(x^(2*j)), 2*j-2)+ polcoeff((1+x+x^2)^(m-1)+O(x^(2*j)), 2*j-1))))^-1)[n+2, 2])}
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CROSSREFS
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Cf. A104030.
Sequence in context: A068102 A001923 A023880 this_sequence A023882 A109780 A093448
Adjacent sequences: A104028 A104029 A104030 this_sequence A104032 A104033 A104034
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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), Feb 26 2005
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