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A009074
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Expansion of e.g.f. cos(tan(x))/exp(x).
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2
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1, -1, 0, 2, -12, 44, -216, 944, -5296, 27632, -168128, 975072, -5391680, 27882048, 38412672, -1986004224, 61881368832, -850359527680, 16576603568128, -222801125934592, 4120672559178752, -57863671042155520
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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[Tan[x]]/Exp[x], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jul 24 2018 *)
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PROG
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(PARI) x='x+O('x^30); Vec(serlaplace(cos(tan(x))/exp(x))) \\ G. C. Greubel, Jul 24 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(Tan(x))/Exp(x))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 24 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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