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

Terms

a(0) =1a(1) =2a(2) =4a(3) =14a(4) =64a(5) =282a(6) =1504a(7) =9382a(8) =59392a(9) =417842a(10) =3234304a(11) =25854270a(12) =222423040a(13) =2039652682a(14) =19398688768a(15) =195195414998