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A009757
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Expansion of e.g.f. tan(x)/cos(tan(x)), odd powers only.
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1
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1, 5, 101, 4297, 311017, 34201485, 5316286925, 1110355789329, 300067100236625, 101902284312853013, 42484968788050104757, 21335944225303831614809, 12704193401200858575308601, 8850034105543023432746843549, 7130974518135579153768747620893
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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[{nmax = 50}, CoefficientList[Series[Tan[x]/Cos[Tan[x]], {x, 0, nmax}], x]*Range[0, nmax - 1]!][[2 ;; ;; 2]] (* G. C. Greubel, Feb 12 2018 *)
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PROG
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(PARI) x='x+O('x^50); v=Vec(serlaplace(tan(x)/cos(tan(x)))); vector((#v-1)\2 , n, v[2*n-1]) \\ G. C. Greubel, Feb 12 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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