Expansion of e.g.f. (2 - exp(x))^3.

Terms

a(0) =1a(1) =-3a(2) =3a(3) =9a(4) =3a(5) =-63a(6) =-357a(7) =-1431a(8) =-5037a(9) =-16623a(10) =-52917a(11) =-164871a(12) =-506877a(13) =-1545183a(14) =-4684677a(15) =-14152311a(16) =-42653517a(17) =-128353743a(18) =-385847637a(19) =-1159115751a(20) =-3480492957a(21) =-10447770303a(22) =-31355893797a(23) =-94092847191a(24) =-282328873197a(25) =-847087282863