This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A240091 #10 Oct 20 2022 22:53:26 %S A240091 1,9,9801,997002999,9996000599960001,9999500009999900000499999, %T A240091 999994000014999980000014999994000001, %U A240091 9999993000002099999650000034999997900000069999999,9999999200000027999999440000006999999944000000279999999200000001 %N A240091 a(n) = (10^n - 1)^n. %e A240091 a(3) = 999^3 = 997002999. %Y A240091 Cf. A024115. %K A240091 nonn %O A240091 0,2 %A A240091 _Hannah Ko_, Mar 31 2014 %E A240091 Extended by _N. J. A. Sloane_, Apr 01 2014