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

Terms

a(0) =1a(1) =-1a(2) =0a(3) =4a(4) =-12a(5) =-12a(6) =216a(7) =-296a(8) =-5296a(9) =25200a(10) =168128a(11) =-1885952a(12) =-5391680a(13) =163728576a(14) =-38412672a(15) =-16916558720a(16) =61881368832