Expansion of e.g.f.: (sec(x)*tan(x))^2*(1+sin(x)).

Terms

a(0) =0a(1) =0a(2) =2a(3) =6a(4) =40a(5) =180a(6) =1232a(7) =7266a(8) =56320a(9) =408360a(10) =3610112a(11) =30974526a(12) =309836800a(13) =3065784540a(14) =34342971392a(15) =384653685786