a(n) = (6*n + 4)^3.

Terms

a(0) =64a(1) =1000a(2) =4096a(3) =10648a(4) =21952a(5) =39304a(6) =64000a(7) =97336a(8) =140608a(9) =195112a(10) =262144a(11) =343000a(12) =438976a(13) =551368a(14) =681472a(15) =830584a(16) =1000000a(17) =1191016a(18) =1404928a(19) =1643032a(20) =1906624a(21) =2197000a(22) =2515456a(23) =2863288a(24) =3241792