%I #14 Jul 24 2018 21:22:28
%S 1,-1,-11,-253,-9911,-567449,-42551299,-3661191381,-252072060911,
%T 34332471915599,34386811167577477,19519494372343282899,
%U 10751436426722565995609,6281979864370292158301879
%N Expansion of e.g.f. cos(tan(sinh(x))), even terms only.
%H G. C. Greubel, <a href="/A009067/b009067.txt">Table of n, a(n) for n = 0..231</a>
%t With[{nmax = 60}, CoefficientList[Series[Cos[Tan[Sinh[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* _G. C. Greubel_, Jul 24 2018 *)
%o (PARI) x='x+O('x^50); v=Vec(serlaplace(cos(tan(sinh(x))))); vector(#v\2,n,v[2*n-1]) \\ _G. C. Greubel_, Jul 24 2018
%K sign
%O 0,3
%A _R. H. Hardin_
%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997