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

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =2a(4) =0a(5) =29a(6) =-135a(7) =727a(8) =-1967a(9) =-6074a(10) =94510a(11) =1548051a(12) =-41361089a(13) =408842095a(14) =213929807a(15) =-41951737904a(16) =130060640466