Expansion of e.g.f.: x^2*(exp(x)-1)^4.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =720a(7) =10080a(8) =87360a(9) =604800a(10) =3674160a(11) =20512800a(12) =108044640a(13) =545688000a(14) =2671036368a(15) =12763951200a(16) =59856451200a(17) =276499641600