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

Terms

a(0) =1a(1) =0a(2) =0a(3) =-3a(4) =7a(5) =-30a(6) =194a(7) =-1365a(8) =10893a(9) =-98028a(10) =980324a(11) =-10783575a(12) =129402835a(13) =-1682236842a(14) =23551315878a(15) =-353269738185