a(n) = (9*n + 4)^3.

Terms

a(0) =64a(1) =2197a(2) =10648a(3) =29791a(4) =64000a(5) =117649a(6) =195112a(7) =300763a(8) =438976a(9) =614125a(10) =830584a(11) =1092727a(12) =1404928a(13) =1771561a(14) =2197000a(15) =2685619a(16) =3241792a(17) =3869893a(18) =4574296a(19) =5359375a(20) =6229504a(21) =7189057a(22) =8242408