Expansion of e.g.f.: sin(log(1+tan(x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =3a(4) =-8a(5) =26a(6) =-46a(7) =-542a(8) =12272a(9) =-196204a(10) =2970284a(11) =-46125412a(12) =747689152a(13) =-12796612984a(14) =231568711464