G.f.: Sum_{k>=0} x^(k^3) / Product_{j=1..k^3} (1 - x^j).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =2a(10) =3a(11) =4a(12) =6a(13) =8a(14) =12a(15) =16a(16) =23a(17) =30a(18) =41a(19) =53a(20) =71a(21) =90a(22) =117a(23) =147a(24) =187a(25) =231a(26) =289a(27) =354a(28) =436a(29) =528