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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =14a(5) =46a(6) =242a(7) =1114a(8) =7814a(9) =46246a(10) =405482a(11) =2933074a(12) =30860414a(13) =263817646a(14) =3238391522a(15) =31943268634a(16) =448122565814