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

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-3a(4) =-5a(5) =-10a(6) =-27a(7) =-91a(8) =-350a(9) =-1459a(10) =-6466a(11) =-30258a(12) =-149051a(13) =-771157a(14) =-4181702a(15) =-23718221a(16) =-140437759a(17) =-866481074a(18) =-5561061327a(19) =-37066185842a(20) =-256190732502