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 A109684 #4 Sep 08 2013 13:30:46 %S A109684 2,21,220,2222,22211,222210,2222212,22222201,222222200,2222222202, %T A109684 22222222221,222222222120,2222222222122,22222222222111, %U A109684 222222222222110,2222222222222112,22222222222222101,222222222222222100 %N A109684 Ternary equivalents of A109682. %K A109684 nonn,easy %O A109684 1,1 %A A109684 _Philippe Deléham_, Aug 08 2005