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

Terms

a(0) =1a(1) =0a(2) =0a(3) =-3a(4) =11a(5) =-70a(6) =534a(7) =-4725a(8) =47753a(9) =-542988a(10) =6859084a(11) =-95298995a(12) =1444301715a(13) =-23711336922a(14) =419190167434