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 A210584 #14 Jul 13 2013 12:04:25
%S A210584 1,2,3,4,12,13,14,23,24,34,112,113,114,122,123,124,132,133,134,142,
%T A210584 143,144,223,224,233,234,243,244,334,344,1112,1113,1114,1122,1123,
%U A210584 1124,1132,1133,1134,1142,1143,1144,1213,1214,1222,1223,1224,1232,1233,1234
%N A210584 List of Lyndon words on {1,2,3,4} sorted first by length and then lexicographically.
%H A210584 Reinhard Zumkeller, <a href="/A210584/b210584.txt">Table of n, a(n) for n = 1..10000</a>
%H A210584 Reinhard Zumkeller, <a href="/A210585/a210585.hs.txt">Haskell programs for some sequences concerning Lyndon words</a>
%H A210584 Wikipedia, <a href="http://en.wikipedia.org/wiki/Lyndon_word">Lyndon word</a>
%H A210584 <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a>
%o A210584 (Haskell) cf. link.
%Y A210584 Cf. A102659, A102660, A210585.
%K A210584 nonn
%O A210584 1,2
%A A210584 _Reinhard Zumkeller_, Mar 23 2012