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

Terms

a(0) =1a(1) =4a(2) =17a(3) =80a(4) =409a(5) =2180a(6) =11737a(7) =62816a(8) =332305a(9) =1736612a(10) =8978305a(11) =46013456a(12) =234220393a(13) =1186159460a(14) =5984472841a(15) =30111025760a(16) =151210395553a(17) =758304756164