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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-1a(4) =0a(5) =-11a(6) =15a(7) =27a(8) =-504a(9) =11817a(10) =-94185a(11) =1226455a(12) =-12442056a(13) =155936221a(14) =-1995562569a(15) =27870901107a(16) =-423463160400