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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =5a(6) =8a(7) =12a(8) =17a(9) =25a(10) =34a(11) =46a(12) =64a(13) =86a(14) =114a(15) =151a(16) =200a(17) =258a(18) =335a(19) =431a(20) =552a(21) =703a(22) =891a(23) =1121a(24) =1411a(25) =1764a(26) =2196a(27) =2725a(28) =3374a(29) =4155