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 A191212 #4 Mar 30 2012 18:57:31 %S A191212 1,5,6,8,17,20,22,26,53,62,68,70,80,82,90,106,120,161,188,206,212,214, %T A191212 242,248,250,272,274,282,320,322,330,362,376,426,440,485,566,568,620, %U A191212 638,644,646,728,746,752,754,818,824,826,848,850,858,962,968,970,992,994,1002,1088,1090,1098,1130,1144,1280,1282,1290,1322 %N A191212 Integers in (-2+A191144)/3; contains A191144 as a proper subsequence. %C A191212 See A191144. %t A191212 (See A191144.) %Y A191212 Cf. A191144, A191113. %K A191212 nonn %O A191212 1,2 %A A191212 _Clark Kimberling_, May 28 2011