a(n) = (7*n + 4)^3.

Terms

a(0) =64a(1) =1331a(2) =5832a(3) =15625a(4) =32768a(5) =59319a(6) =97336a(7) =148877a(8) =216000a(9) =300763a(10) =405224a(11) =531441a(12) =681472a(13) =857375a(14) =1061208a(15) =1295029a(16) =1560896a(17) =1860867a(18) =2197000a(19) =2571353a(20) =2985984a(21) =3442951a(22) =3944312a(23) =4492125a(24) =5088448