Expansion of e.g.f. exp(x)*(exp(x) - 1)*(exp(x) - x - 1)^2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =30a(6) =390a(7) =3080a(8) =19236a(9) =104874a(10) =524250a(11) =2471172a(12) =11176968a(13) =49065302a(14) =210698670a(15) =890007456a(16) =3712887756a(17) =15342622434a(18) =62938446690a(19) =256735466012