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A009090
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Expansion of e.g.f. cos(tanh(x))/exp(x).
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2
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1, -1, 0, 2, 4, -36, -56, 944, 1744, -41104, -86208, 2650592, 6199744, -237023424, -608357504, 28021573376, 77889982720, -4225816615168, -12588540708864, 790713657219584, 2503565961032704, -179579770991391744
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nmax = 30}, CoefficientList[Series[Cos[Tanh[x]]/Exp[x], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jul 25 2018 *)
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PROG
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(PARI) x='x+O('x^30); Vec(serlaplace(cos(tanh(x))/exp(x))) \\ G. C. Greubel, Jul 25 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(Tanh(x))/Exp(x))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 25 2018
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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