Expansion of e.g.f. exp(3*x)*exp(x^2).

Terms

a(0) =1a(1) =3a(2) =11a(3) =45a(4) =201a(5) =963a(6) =4899a(7) =26253a(8) =147345a(9) =862083a(10) =5238459a(11) =32957037a(12) =214117209a(13) =1433320515a(14) =9867008979a(15) =69734001357a(16) =505212273441