Expansion of log(1+log(1+x))/cos(x).

Terms

a(0) =0a(1) =1a(2) =-2a(3) =10a(4) =-47a(5) =323a(6) =-2509a(7) =24022a(8) =-262884a(9) =3312757a(10) =-46812246a(11) =736778634a(12) =-12755932287a(13) =241166285111