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

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-2a(4) =-2a(5) =1a(6) =4a(7) =13a(8) =22a(9) =36a(10) =47a(11) =54a(12) =37a(13) =-11a(14) =-129a(15) =-346a(16) =-709a(17) =-1257a(18) =-2023a(19) =-2979a(20) =-4014a(21) =-4836a(22) =-4851a(23) =-3041a(24) =2310a(25) =13785a(26) =35186a(27) =71598a(28) =129624a(29) =216732