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 A009074 Expansion of e.g.f. cos(tan(x))/exp(x). 2
 1, -1, 0, 2, -12, 44, -216, 944, -5296, 27632, -168128, 975072, -5391680, 27882048, 38412672, -1986004224, 61881368832, -850359527680, 16576603568128, -222801125934592, 4120672559178752, -57863671042155520 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS G. C. Greubel, Table of n, a(n) for n = 0..250 MATHEMATICA With[{nmax = 30}, CoefficientList[Series[Cos[Tan[x]]/Exp[x], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jul 24 2018 *) PROG (PARI) x='x+O('x^30); Vec(serlaplace(cos(tan(x))/exp(x))) \\ G. C. Greubel, Jul 24 2018 (Magma) m:=30; R:=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 CROSSREFS Sequence in context: A013704 A025495 A028570 * A371487 A356868 A267344 Adjacent sequences: A009071 A009072 A009073 * A009075 A009076 A009077 KEYWORD sign,easy AUTHOR R. H. Hardin EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 STATUS approved

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Last modified September 17 19:08 EDT 2024. Contains 375990 sequences. (Running on oeis4.)