a(n) = n^3 + 3.

Terms

a(0) =3a(1) =4a(2) =11a(3) =30a(4) =67a(5) =128a(6) =219a(7) =346a(8) =515a(9) =732a(10) =1003a(11) =1334a(12) =1731a(13) =2200a(14) =2747a(15) =3378a(16) =4099a(17) =4916a(18) =5835a(19) =6862a(20) =8003a(21) =9264a(22) =10651a(23) =12170a(24) =13827a(25) =15628a(26) =17579a(27) =19686a(28) =21955a(29) =24392