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 A031038 #4 Mar 30 2012 18:56:20 %S A031038 2,13,24,26,28,29,30,32,34,36,38,45,61,77,93,109,128,152,169,172,175, %T A031038 176,178,181,184,187,190,200,224,248,272,296,312,315,318,320,321,324, %U A031038 327,330,333,336,339,342,344,345,348,351,354 %N A031038 Position of n-th 2 in A031035. %K A031038 nonn %O A031038 1,1 %A A031038 _Clark Kimberling_