E.g.f.: Expansion of sin(tan(x)*exp(x)).

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =0a(5) =-68a(6) =-728a(7) =-5952a(8) =-45696a(9) =-327984a(10) =-2158048a(11) =-10849984a(12) =1959936a(13) =1293807296a(14) =28759028352a(15) =496656980992