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

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =-3a(6) =-42a(7) =-273a(8) =-1336a(9) =-5159a(10) =-16726a(11) =62139a(12) =1194700a(13) =16414101a(14) =153304830a(15) =1357293927a(16) =10698400400a(17) =59192332081a(18) =188012481362