Expansion of e.g.f. exp(4x) * I_0(2x).

Terms

a(0) =1a(1) =4a(2) =18a(3) =88a(4) =454a(5) =2424a(6) =13236a(7) =73392a(8) =411462a(9) =2325976a(10) =13233628a(11) =75682512a(12) =434662684a(13) =2505229744a(14) =14482673832a(15) =83940771168a(16) =487610895942