Expansion of e.g.f. exp(x^2/2 * (1 + x)^3).

Terms

a(0) =1a(1) =0a(2) =1a(3) =9a(4) =39a(5) =150a(6) =1365a(7) =13545a(8) =105945a(9) =918540a(10) =10603845a(11) =127806525a(12) =1468823895a(13) =18253765530a(14) =257397445305