Expansion of e.g.f. exp(4 * (1 - exp(-x)) + x).

Terms

a(0) =1a(1) =5a(2) =21a(3) =69a(4) =149a(5) =69a(6) =-619a(7) =-187a(8) =9365a(9) =-3515a(10) =-193643a(11) =453957a(12) =4704917a(13) =-29425595a(14) =-83918443a(15) =1640246085a(16) =-3184430955a(17) =-74516517307a(18) =604223657877