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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =4a(8) =7a(9) =8a(10) =12a(11) =14a(12) =22a(13) =25a(14) =37a(15) =47a(16) =64a(17) =81a(18) =113a(19) =140a(20) =191a(21) =243a(22) =319a(23) =408a(24) =540a(25) =677a(26) =889a(27) =1132a(28) =1462a(29) =1855