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Search: id:A091699
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| 1, 0, -1, 3, -9, 30, -109, 420, -1685, 6960, -29391, 126291, -550359, 2426502, -10803801, 48507843, -219377949, 998436792, -4569488371, 21016589073, -97090411019, 450314942682, -2096122733211, 9788916220518
(list; graph; listen)
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OFFSET
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0,4
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FORMULA
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G.f.: A(x) = 2/(3+3*x - sqrt(1+6*x+5*x^2)). - Paul D. Hanna (pauldhanna(AT)juno.com), Feb 23 2004
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PROGRAM
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(PARI) a(n)=polcoeff(2/(3+3*x-sqrt(1+6*x+5*x^2+x*O(x^n))), n, x) (Paul Hanna)
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CROSSREFS
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Sequence in context: A128725 A099783 A032125 this_sequence A129167 A151472 A107379
Adjacent sequences: A091696 A091697 A091698 this_sequence A091700 A091701 A091702
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KEYWORD
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sign
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Jan 29 2004
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