Expansion of e.g.f. cos(tanh(x))/exp(x).

Terms

a(0) =1a(1) =-1a(2) =0a(3) =2a(4) =4a(5) =-36a(6) =-56a(7) =944a(8) =1744a(9) =-41104a(10) =-86208a(11) =2650592a(12) =6199744a(13) =-237023424a(14) =-608357504a(15) =28021573376a(16) =77889982720