Expansion of e.g.f. (1+x)*exp(3*x)*cosh(x).

Terms

a(0) =1a(1) =4a(2) =16a(3) =66a(4) =280a(5) =1208a(6) =5248a(7) =22816a(8) =98944a(9) =427392a(10) =1838080a(11) =7870976a(12) =33568768a(13) =142637056a(14) =604045312a(15) =2550276096a(16) =10737713152a(17) =45097779200a(18) =188979871744a(19) =790276734976