Expansion of Sum_{k>=0} x^(k^2) / Product_{j=1..k} (1 + j*x^j).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =0a(5) =0a(6) =-2a(7) =2a(8) =2a(9) =-1a(10) =-7a(11) =5a(12) =8a(13) =-4a(14) =-22a(15) =23a(16) =30a(17) =-32a(18) =-101a(19) =102a(20) =160a(21) =-81a(22) =-434a(23) =288a(24) =515a(25) =-249a(26) =-1393a(27) =1542a(28) =1756a(29) =-1950