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A009069
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Expansion of e.g.f. cos(tan(tanh(x))), even terms only.
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1
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1, -1, 1, 47, -1343, 8671, 2436545, -249528945, 10176663169, 1606374108095, -482969577637247, 59264468409177327, 4209524591120115521, -4541227341778149686881, 1235175100383899185304129
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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 = 60}, CoefficientList[Series[Cos[Tan[Tanh[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 24 2018 *)
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PROG
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(PARI) x='x+O('x^50); v=Vec(serlaplace(cos(tan(tanh(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 24 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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