Expansion of e.g.f.: cos(tanh(log(1+x))).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-2a(5) =-40a(6) =314a(7) =-1134a(8) =-3044a(9) =87408a(10) =-733636a(11) =1835020a(12) =43592176a(13) =-792796368a(14) =6272579312a(15) =14019198480