Expansion of Product_{k>=1} (1 - k!*x^k).

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-4a(4) =-18a(5) =-84a(6) =-564a(7) =-3984a(8) =-33504a(9) =-307728a(10) =-3156192a(11) =-35254080a(12) =-429350400a(13) =-5641133760a(14) =-79720588800