n^3 + n-th cubefree number.

Terms

a(0) =2a(1) =10a(2) =30a(3) =68a(4) =130a(5) =222a(6) =350a(7) =521a(8) =739a(9) =1011a(10) =1343a(11) =1741a(12) =2211a(13) =2759a(14) =3392a(15) =4114a(16) =4932a(17) =5852a(18) =6880a(19) =8022a(20) =9284a(21) =10673a(22) =12193a(23) =13852a(24) =15654a(25) =17606a(26) =19714a(27) =21985a(28) =24423a(29) =27035