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 A069666 #3 Dec 05 2013 19:55:16 %S A069666 9,49,784,6889,97969,877969,9696996,88679889,876988996,8998988769, %T A069666 88998998929,975979998889,9998768898889,97888999968769, %U A069666 898999897988929,9896999999766889,99497897999899876,989879999979599689 %N A069666 Largest n-digit square with maximum digit sum. %Y A069666 Cf. A069661, A069662, A069663, A069664, A069665. %K A069666 nonn,base %O A069666 1,1 %A A069666 _Amarnath Murthy_, Apr 06 2002 %E A069666 Corrected and extended by Larry Reeves (larryr(AT)acm.org), Oct 14 2003