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A009073
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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, -2, 4, -128, 1296, -85600, 4372160, -148860416, 54261590272, 1474575037952, 1579094994228224, 145025202842173440, 87575771555229601792, 13290672132247757398016, 8077796113026531668901888
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Cos[Tan[x]]/Cosh[x], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Feb 12 2015 *)
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PROG
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(PARI) x='x+O('x^50); 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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