Expansion of e.g.f. Product_{k>=2} (1 + x^k/k).

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =6a(5) =44a(6) =210a(7) =1644a(8) =11088a(9) =119664a(10) =1034640a(11) =12372480a(12) =139629600a(13) =1877722560a(14) =25389131040a(15) =395162832960