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

Terms

a(0) =1a(1) =1a(2) =-1a(3) =2a(4) =-2a(5) =0a(6) =1a(7) =2a(8) =-4a(9) =-3a(10) =7a(11) =4a(12) =-4a(13) =-14a(14) =6a(15) =10a(16) =12a(17) =-14a(18) =0a(19) =-26a(20) =3a(21) =7a(22) =60a(23) =11a(24) =-27a(25) =-99a(26) =-26a(27) =6a(28) =126a(29) =94