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

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-18a(5) =100a(6) =-726a(7) =5698a(8) =-52028a(9) =522720a(10) =-5849876a(11) =71473468a(12) =-951628488a(13) =13674233040a(14) =-211091632376