a(n) = (10*n + 9)^6.

Terms

a(0) =531441a(1) =47045881a(2) =594823321a(3) =3518743761a(4) =13841287201a(5) =42180533641a(6) =107918163081a(7) =243087455521a(8) =496981290961a(9) =941480149401