Expansion of log(1+x)/cosh(sin(x)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-1a(4) =0a(5) =49a(6) =-165a(7) =-393a(8) =-504a(9) =70785a(10) =-434385a(11) =-517265a(12) =-12647976a(13) =654552625a(14) =-6276987717a(15) =18362076327a(16) =-636272644560