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

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =20a(5) =157a(6) =902a(7) =6895a(8) =77352a(9) =837145a(10) =9239882a(11) =124480059a(12) =1864519868a(13) =28461793141a(14) =470175087566