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

Terms

a(0) =1a(1) =0a(2) =2a(3) =-3a(4) =23a(5) =-90a(6) =676a(7) =-4305a(8) =37533a(9) =-325332a(10) =3366166a(11) =-36472095a(12) =443702291a(13) =-5732993838a(14) =80707226328