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

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =8a(5) =12a(6) =18a(7) =26a(8) =38a(9) =54a(10) =75a(11) =103a(12) =141a(13) =190a(14) =254a(15) =337a(16) =444a(17) =580a(18) =754a(19) =973a(20) =1250a(21) =1597a(22) =2030a(23) =2568a(24) =3237a(25) =4061a(26) =5076a(27) =6322a(28) =7847a(29) =9705