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 A191189 #4 Mar 30 2012 18:57:31 %S A191189 1,4,13,31,40,49,112,121,148,157,193,274,355,364,436,445,472,481,580, %T A191189 589,625,769,1003,1084,1093,1327,1336,1408,1417,1444,1453,1732,1741, %U A191189 1768,1777,1876,1885,1921,2308,2317,2353,2461,2497 %N A191189 Integers in (3+A191132)/4; contains A191132 as a proper subsequence. %C A191189 See A191132. %t A191189 (See A191132.) %Y A191189 Cf. A191132, A191113. %K A191189 nonn %O A191189 1,2 %A A191189 _Clark Kimberling_, May 27 2011