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 A190558 #4 Mar 30 2012 18:57:28 %S A190558 1,6,8,13,18,23,25,30,35,37,42,47,49,52,54,59,64,66,71,76,78,83,88,93, %T A190558 95,100,105,107,112,117,122,124,129,134,136,141,146,148,153,158,163, %U A190558 165,170,175,177,182,187,192,194,199,204,206,211,216,218,221,223,228,233,235,240,245,247,252,257,262,264,269,274,276,281,286,288 %N A190558 Positions of 2 in A190555. %C A190558 See A190555. %t A190558 (See A190555.) %Y A190558 Cf. A190555. %K A190558 nonn %O A190558 1,2 %A A190558 _Clark Kimberling_, May 12 2011