a(n) = (9*n + 2)^6.

Terms

a(0) =64a(1) =1771561a(2) =64000000a(3) =594823321a(4) =3010936384a(5) =10779215329a(6) =30840979456a(7) =75418890625a(8) =164206490176a(9) =326940373369a(10) =606355001344