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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =5a(4) =-12a(5) =109a(6) =-405a(7) =4913a(8) =-24976a(9) =372633a(10) =-2419425a(11) =42646845a(12) =-338219244a(13) =6863821509a(14) =-64452230661