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 A122925 #2 Mar 30 2012 17:35:16 %S A122925 0,1,5,11,24,39,53,83,96,155,176,257,224,335,376,499,384,687,701,899, %T A122925 704,1043,1104,1379,896,1559,1584,1883,1504,2239,2096,2617,1536,2963, %U A122925 2864,3259,2912,3761,3728,3956,2816,4529,4304,5276,4416,5588,5688,5849 %N A122925 Index of first occurrence of n in A122921. %C A122925 The last occurrence of n in A122921 is at 4n^2. %Y A122925 Cf. A122921, A122926, A122927. %K A122925 nonn %O A122925 0,3 %A A122925 _Franklin T. Adams-Watters_, Sep 19 2006