Largest n-digit perfect power.

Terms

a(0) =9a(1) =81a(2) =961a(3) =9801a(4) =99856a(5) =998001a(6) =9998244a(7) =99980001a(8) =999950884a(9) =9999800001a(10) =99999515529a(11) =999998000001