a(n) = (9*n+5)^3.

Terms

a(0) =125a(1) =2744a(2) =12167a(3) =32768a(4) =68921a(5) =125000a(6) =205379a(7) =314432a(8) =456533a(9) =636056a(10) =857375a(11) =1124864a(12) =1442897a(13) =1815848a(14) =2248091a(15) =2744000a(16) =3307949a(17) =3944312a(18) =4657463a(19) =5451776a(20) =6331625a(21) =7301384a(22) =8365427