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

Terms

a(0) =1a(1) =1a(2) =2a(3) =18a(4) =84a(5) =420a(6) =3720a(7) =31080a(8) =243600a(9) =2434320a(10) =26641440a(11) =283076640a(12) =3293801280a(13) =42404281920a(14) =554325932160