Expansion of e.g.f. exp(x) / (2 - cos(x)).

Terms

a(0) =1a(1) =1a(2) =0a(3) =-2a(4) =2a(5) =26a(6) =-30a(7) =-622a(8) =982a(9) =25846a(10) =-50910a(11) =-1639142a(12) =3874862a(13) =147434366a(14) =-406614390a(15) =-17851478062a(16) =56266545142