Expansion of e.g.f.: x^3*(exp(x)-1)^3.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =720a(7) =7560a(8) =50400a(9) =272160a(10) =1300320a(11) =5738040a(12) =23958000a(13) =96061680a(14) =373477104a(15) =1417295880a(16) =5274360000a(17) =19313985600a(18) =69770966976a(19) =249130574424a(20) =880629138000