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 A190774 #4 Mar 30 2012 18:57:29 %S A190774 4,7,11,14,21,24,28,31,38,41,45,48,52,55,62,65,69,72,79,82,86,89,96, %T A190774 103,106,110,113,120,123,127,130,137,140,144,147,151,154,161,164,168, %U A190774 171,178,181,185,188,192,195,202,205,209,212,219,222,226,229,236,239,243,246,250,253,260,263,267,270,277,280,284,287,291,294,301 %N A190774 Positions of 3 in A190770. %C A190774 See A190770. %t A190774 (See A190770.) %Y A190774 Cf. A190770. %K A190774 nonn %O A190774 1,1 %A A190774 _Clark Kimberling_, May 19 2011