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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =24a(5) =120a(6) =420a(7) =1260a(8) =3472a(9) =9072a(10) =22860a(11) =56100a(12) =134904a(13) =319176a(14) =745108a(15) =1719900a(16) =3931680a(17) =8912352a(18) =20053404a(19) =44825940a(20) =99613960a(21) =220200120a(22) =484441188a(23) =1061157900a(24) =2315254704a(25) =5033163600a(26) =10905189100a(27) =23555209860a(28) =50734299672a(29) =108984793512