a(1) = 2, a(n) = a(n-1) + 3*(a(n-1)-floor(a(n-1)^(1/3))^3).

Terms

a(0) =2a(1) =5a(2) =17a(3) =44a(4) =95a(5) =188a(6) =377a(7) =479a(8) =887a(9) =1361a(10) =1451a(11) =1811a(12) =2060a(13) =3056a(14) =3992a(15) =5843a(16) =5876a(17) =6008a(18) =6536a(19) =8648a(20) =10592a(21) =14585a(22) =16868a(23) =20597a(24) =23339a(25) =27500a(26) =29000a(27) =35000a(28) =41696a(29) =48872