a(n) = n^10 - n^9.

Terms

a(0) =0a(1) =0a(2) =512a(3) =39366a(4) =786432a(5) =7812500a(6) =50388480a(7) =242121642a(8) =939524096a(9) =3099363912a(10) =9000000000a(11) =23579476910a(12) =56757583872a(13) =127253992476a(14) =268593608192a(15) =538207031250