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 A162339 #2 Mar 30 2012 17:34:00 %S A162339 0,1,4,2,6,4,6,7,9,5,7,11,12,10,6,8,14,16,14,20,18,15,19,21,19,21,19, %T A162339 15,23,33,27,26,24,26,22,30,28,30,28,26,28,30,20,28,38,36,31,37,41,45, %U A162339 43,39,43,39,43,45,43,47,43,49,46,52 %N A162339 Numbers A161912 such that a(n)<>a(n+1). %Y A162339 Cf. A161911, A161912, A161913, A162188, A162189. %K A162339 nonn %O A162339 1,3 %A A162339 _Omar E. Pol_, Jul 04 2009