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

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =10a(6) =14a(7) =19a(8) =26a(9) =35a(10) =46a(11) =60a(12) =77a(13) =98a(14) =124a(15) =156a(16) =195a(17) =242a(18) =299a(19) =367a(20) =448a(21) =545a(22) =660a(23) =796a(24) =957a(25) =1146a(26) =1368a(27) =1629a(28) =1933a(29) =2287