a(n) = (3*n + 2)^3.

Terms

a(0) =8a(1) =125a(2) =512a(3) =1331a(4) =2744a(5) =4913a(6) =8000a(7) =12167a(8) =17576a(9) =24389a(10) =32768a(11) =42875a(12) =54872a(13) =68921a(14) =85184a(15) =103823a(16) =125000a(17) =148877a(18) =175616a(19) =205379a(20) =238328a(21) =274625a(22) =314432a(23) =357911a(24) =405224a(25) =456533a(26) =512000a(27) =571787a(28) =636056a(29) =704969