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

Terms

a(0) =1a(1) =3a(2) =11a(3) =55a(4) =309a(5) =1931a(6) =13543a(7) =101991a(8) =828425a(9) =7192819a(10) =66002691a(11) =639830423a(12) =6510397501a(13) =69266297595a(14) =768989536799