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 A191252 #4 Mar 30 2012 18:57:31 %S A191252 2,6,9,11,15,17,21,25,28,30,34,38,41,43,47,50,52,56,58,62,66,69,71,75, %T A191252 78,80,84,86,90,94,97,99,103,105,109,113,116,118,122,126,129,131,135, %U A191252 138,140,144,146,150,154,157,159,163,165,169,173,176,178,182,186,189,191,195,198,200,204,206,210,214,217 %N A191252 Positions of 1 in A191250. %C A191252 See A191250. %t A191252 (See A191250.) %Y A191252 Cf. A191250. %K A191252 nonn %O A191252 1,1 %A A191252 _Clark Kimberling_, May 28 2011