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A009082
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Expansion of e.g.f. cos(tan(x)/cosh(x)), even terms only.
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1
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1, -1, 5, -157, 3817, -257049, 15886125, -1844058101, 218349214545, -38729647296945, 7468216325125589, -1882371895493492429, 533348579359954590009, -181834605583994802568393
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nmax = 60}, CoefficientList[Series[Cos[Tan[x]/Cosh[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^60); v=Vec(serlaplace(cos(tan(x)/cosh(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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