a(n) = (12*n + 8)^3.

Terms

a(0) =512a(1) =8000a(2) =32768a(3) =85184a(4) =175616a(5) =314432a(6) =512000a(7) =778688a(8) =1124864a(9) =1560896a(10) =2097152a(11) =2744000a(12) =3511808a(13) =4410944a(14) =5451776a(15) =6644672a(16) =8000000a(17) =9528128a(18) =11239424a(19) =13144256a(20) =15252992a(21) =17576000a(22) =20123648