G.f.: Sum_{k>=1} (k^2 * x^(k^2) / Product_{j=1..k} (1 - x^j)).

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =5a(5) =5a(6) =9a(7) =9a(8) =13a(9) =22a(10) =26a(11) =35a(12) =48a(13) =57a(14) =70a(15) =88a(16) =117a(17) =135a(18) =173a(19) =207a(20) =261a(21) =304a(22) =374a(23) =433a(24) =528a(25) =628a(26) =739a(27) =864a(28) =1032a(29) =1198