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 A031237 #4 Mar 30 2012 18:56:21 %S A031237 1,6,7,8,10,12,14,17,27,37,47,48,50,53,56,59,61,62,63,64,65,67,68,70, %T A031237 71,73,74,77,78,80,83,86,89,92,93,95,98,101,104,107,108,110,113,116, %U A031237 119,123,136,138,139,142,145,148,153,168,183,198 %N A031237 Position of n-th 1 in A031235. %K A031237 nonn %O A031237 1,2 %A A031237 _Clark Kimberling_