E.g.f. sin(arctan(x)*exp(x)).

Terms

a(0) =0a(1) =1a(2) =2a(3) =0a(4) =-16a(5) =-60a(6) =-40a(7) =336a(8) =-2560a(9) =-20976a(10) =342688a(11) =4002944a(12) =-24866048a(13) =-523996096a(14) =3812202368a(15) =103065059072a(16) =-777384271872