G.f.: Sum_{k>=0} x^(k^4) / Product_{j=1..k^4} (1 - x^j).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =1a(13) =1a(14) =1a(15) =1a(16) =2a(17) =2a(18) =3a(19) =4a(20) =6a(21) =8a(22) =12a(23) =16a(24) =23a(25) =31a(26) =43a(27) =57a(28) =78a(29) =102