Expansion of cosh(tan(x).exp(x)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =6a(4) =33a(5) =180a(6) =1137a(7) =8218a(8) =68929a(9) =640584a(10) =6534049a(11) =71605710a(12) =842179041a(13) =10543617084a(14) =140430103569