a(n) = (5*n + 4)^6.

Terms

a(0) =4096a(1) =531441a(2) =7529536a(3) =47045881a(4) =191102976a(5) =594823321a(6) =1544804416a(7) =3518743761a(8) =7256313856a(9) =13841287201a(10) =24794911296a(11) =42180533641a(12) =68719476736a(13) =107918163081a(14) =164206490176a(15) =243087455521a(16) =351298031616