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%I #15 Jan 22 2018 02:38:51
%S 1,-4,-4,104,5392,167936,1592384,-401669248,-50456008448,
%T -2742470413312,310319594802176,116183782320392192,
%U 12985923007223566336,-3777809306960427778048,-2961060938622580774715392
%N Expansion of e.g.f. sin(x)/cosh(tan(x)) (odd powers only).
%H G. C. Greubel, <a href="/A009559/b009559.txt">Table of n, a(n) for n = 0..240</a>
%t With[{nmax = 50}, CoefficientList[Series[Sin[x]/Cosh[Tan[x]], {x, 0, nmax}], x]*Range[0, nmax - 1]!][[2 ;; ;; 2]] (* _G. C. Greubel_, Jan 21 2018 *)
%o (PARI) x='x+O('x^50); v=Vec(serlaplace(sin(x)/cosh(tan(x)))); vector((#v-1)\2 ,n,v[2*n-1]) \\ _G. C. Greubel_, Jan 21 2018
%K sign
%O 0,2
%A _R. H. Hardin_
%E Extended with signs by _Olivier Gérard_, Mar 15 1997
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