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 A025516 #5 Mar 30 2012 18:35:25 %S A025516 2,4,5,7,8,11,14,15,17,20,22,23,26,29,31,32,34,35,38,40,41,43,46,49, %T A025516 50,52,53,56,58,59,61,62,65,68,70,71,73,76,77,79,80,83,85,86,88,89,92, %U A025516 95,96,98,101,103,104,106,107,110,113,115,116,119,122,123,125,128,131,132,134 %N A025516 Index of n-th 2 in A022303. %K A025516 nonn %O A025516 1,1 %A A025516 _David W. Wilson_