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A009115
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Expansion of e.g.f. cos(x)/exp(tanh(x)).
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1
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1, -1, 0, 4, -12, -12, 216, -296, -5296, 25200, 168128, -1885952, -5391680, 163728576, -38412672, -16916558720, 61881368832, 2050105730816, -16576603568128, -282656394482688, 4120672559178752, 42100913802486784
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OFFSET
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0,4
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LINKS
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G. C. Greubel, Table of n, a(n) for n = 0..250
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MATHEMATICA
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With[{nmax = 30}, CoefficientList[Series[Cos[x]/Exp[Tanh[x]], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jul 26 2018 *)
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PROG
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(PARI) x='x+O('x^30); Vec(serlaplace(cos(x)/exp(tanh(x)))) \\ G. C. Greubel, Jul 26 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(x)/Exp(Tanh(x)))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 26 2018
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CROSSREFS
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Sequence in context: A239194 A355801 A357727 * A051434 A074138 A120252
Adjacent sequences: A009112 A009113 A009114 * A009116 A009117 A009118
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KEYWORD
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sign,easy
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
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STATUS
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approved
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