E.g.f.: Product_{k>=1} (1 - (exp(x) - 1)^k / k).

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-3a(4) =0a(5) =55a(6) =572a(7) =4865a(8) =40912a(9) =351675a(10) =2978196a(11) =23418373a(12) =148849544a(13) =84185855a(14) =-27459134420a(15) =-881482705719