%I
%S 0,2,4,42,8,5354,99956,22974,72550928,3076799278,44239291156,
%T 4012843624614,426360266016232,20979538126746554,55444364705437852,
%U 137742540801276301170,16928772211833384004640
%N Expansion of e.g.f. sin(x)*sin(sinh(x)) (even powers only).
%H G. C. Greubel, <a href="/A009547/b009547.txt">Table of n, a(n) for n = 0..250</a>
%t With[{nmax = 50}, CoefficientList[Series[Sin[x]*Sin[Sinh[x]],{x,0,nmax}], x]*Range[0, nmax]!][[1 ;; ;; 2]] (* _G. C. Greubel_, Jan 20 2018 *)
%o (PARI) x='x+O('x^50); v=Vec(serlaplace(sin(x)*sin(sinh(x)))); concat([0], vector(#v\2,n,v[2*n1])) // _G. C. Greubel_, Jan 20 2018
%K sign
%O 0,2
%A _R. H. Hardin_
%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997
