%I #14 Jul 24 2018 21:22:22
%S 1,-1,-3,27,1081,3831,-1567563,-73024877,4980721009,1015258860783,
%T 13245921859181,-20750351796802549,-3030717340459969623,
%U 448360743236395743719,256723841092587388040485
%N Expansion of e.g.f. cos(tan(sin(x))), even terms only.
%H G. C. Greubel, <a href="/A009066/b009066.txt">Table of n, a(n) for n = 0..248</a>
%t With[{nmax = 60}, CoefficientList[Series[Cos[Tan[Sin[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(sin(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