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 A190691 #4 Mar 30 2012 18:57:28 %S A190691 1,5,9,12,13,16,20,23,24,27,31,35,38,39,42,46,50,53,54,57,61,65,68,72, %T A190691 76,79,80,83,87,91,94,95,98,102,106,109,110,113,117,121,124,128,132, %U A190691 135,136,139,143,147,150,151,154,158,162,165,166,169,173,176,177,180,184,188,191,192,195,199,203,206,207,210,214,218,221,222 %N A190691 Positions of 2 in A190688. %C A190691 See A190688. %t A190691 (See A190688.) %Y A190691 Cf. A190688. %K A190691 nonn %O A190691 1,2 %A A190691 _Clark Kimberling_, May 17 2011