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

Terms

a(0) =1a(1) =0a(2) =8a(3) =12a(4) =160a(5) =740a(6) =5424a(7) =37828a(8) =262784a(9) =1868868a(10) =13200880a(11) =89816804a(12) =581630592a(13) =3586158628a(14) =21162503600a(15) =120273982980a(16) =662169758464