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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =720a(7) =5040a(8) =23520a(9) =90720a(10) =312480a(11) =997920a(12) =3017520a(13) =8751600a(14) =24552528a(15) =67026960a(16) =178825920a(17) =467812800a(18) =1203094080a(19) =3048024384a(20) =7620293520a(21) =18826894800a(22) =46021649520a(23) =111421260720a(24) =267411535776a(25) =636694740000