a(n) = Pell(n)^3.

Terms

a(0) =0a(1) =1a(2) =8a(3) =125a(4) =1728a(5) =24389a(6) =343000a(7) =4826809a(8) =67917312a(9) =955671625a(10) =13447314152a(11) =189218084021