a(n) = (5*n+3)^3.

Terms

a(0) =27a(1) =512a(2) =2197a(3) =5832a(4) =12167a(5) =21952a(6) =35937a(7) =54872a(8) =79507a(9) =110592a(10) =148877a(11) =195112a(12) =250047a(13) =314432a(14) =389017a(15) =474552a(16) =571787a(17) =681472a(18) =804357a(19) =941192a(20) =1092727a(21) =1259712a(22) =1442897a(23) =1643032a(24) =1860867a(25) =2097152a(26) =2352637a(27) =2628072a(28) =2924207a(29) =3241792