Expansion of e.g.f. x*exp(3*x)*cosh(x).

Terms

a(0) =0a(1) =1a(2) =6a(3) =30a(4) =144a(5) =680a(6) =3168a(7) =14560a(8) =66048a(9) =296064a(10) =1313280a(11) =5772800a(12) =25178112a(13) =109078528a(14) =469819392a(15) =2013388800a(16) =8590196736a(17) =36507779072a(18) =154620002304a(19) =652837519360