E.g.f.: x^3*exp(x)^2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =6a(4) =48a(5) =240a(6) =960a(7) =3360a(8) =10752a(9) =32256a(10) =92160a(11) =253440a(12) =675840a(13) =1757184a(14) =4472832a(15) =11182080a(16) =27525120a(17) =66846720a(18) =160432128a(19) =381026304a(20) =896532480a(21) =2091909120a(22) =4844421120a(23) =11142168576a(24) =25467813888a(25) =57881395200a(26) =130862284800a(27) =294440140800a(28) =659545915392