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

Terms

a(0) =1a(1) =1a(2) =0a(3) =3a(4) =6a(5) =15a(6) =195a(7) =126a(8) =6860a(9) =10581a(10) =275955a(11) =1581734a(12) =11684442a(13) =223836379a(14) =423165561a(15) =32439219242a(16) =10301267912