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) =2a(5) =2a(6) =4a(7) =4a(8) =8a(9) =9a(10) =17a(11) =19a(12) =38a(13) =42a(14) =80a(15) =97a(16) =174a(17) =208a(18) =389a(19) =460a(20) =826a(21) =1049a(22) =1790a(23) =2248a(24) =3989a(25) =4933a(26) =8451a(27) =11116a(28) =18300a(29) =23742