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 A191204 #4 Mar 30 2012 18:57:31 %S A191204 1,2,5,6,8,17,18,20,22,26,28,30,53,56,62,66,68,70,78,80,86,92,102,118, %T A191204 156,161,170,188,200,206,210,212,222,236,242,246,260,262,270,278,308, %U A191204 310,318,342,348,356,366,406,412,470,485,512,540,566,602,620,632,638,642,668,678,710,728,740,750,782,788,798,812,822,836,838 %N A191204 Integers in (-2+A191140)/3; contains A191140 as a proper subsequence. %C A191204 See A191140. %t A191204 (See A191140.) %Y A191204 Cf. A191140, A191113. %K A191204 nonn %O A191204 1,2 %A A191204 _Clark Kimberling_, May 28 2011