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 A190463 #4 Mar 30 2012 18:57:28 %S A190463 3,8,11,16,21,24,29,37,42,45,50,55,58,63,66,71,76,79,84,92,97,100,105, %T A190463 110,113,118,126,131,134,139,144,147,152,155,160,165,168,173,181,186, %U A190463 189,194,199,202,207,210,215,220,223,228,236,241,244,249,254,257,262,270,275,278,283,288,291,296,299,304,309,312,317,325,330 %N A190463 Positions of 4 in A190457. %C A190463 See A190457. %t A190463 (See A190457.) %Y A190463 Cf. A190457. %K A190463 nonn %O A190463 1,1 %A A190463 _Clark Kimberling_, May 10 2011