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%I #14 Jul 22 2018 22:53:29
%S 1,-1,9,-153,4273,-177489,10342137,-800697641,78896218081,
%T -9587206592289,1403875965476969,-243412313149166137,
%U 49273184499900888465,-11506634193913551650161,3067851166645384439929945
%N Expansion of E.g.f. cos(sin(sin(x))), even powers only.
%H G. C. Greubel, <a href="/A009037/b009037.txt">Table of n, a(n) for n = 0..250</a>
%t With[{nmax = 60}, CoefficientList[Series[Cos[Sin[Sin[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* _G. C. Greubel_, Jul 22 2018 *)
%o (PARI) x='x+O('x^60); v=Vec(serlaplace(cos(sin(sin(x))))); vector(#v\2,n,v[2*n-1]) \\ _G. C. Greubel_, Jul 22 2018
%K sign
%O 0,3
%A _R. H. Hardin_
%E Extended with signs by _Olivier Gérard_, Mar 15 1997
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