Expansion of e.g.f. tan(tanh(x))*exp(x).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =-3a(6) =-42a(7) =-49a(8) =456a(9) =2905a(10) =10154a(11) =-83589a(12) =-1263668a(13) =-334059a(14) =74121726a(15) =351159815a(16) =-1582556016a(17) =-39776495567a(18) =-396499390126