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 A030366 #4 Mar 30 2012 18:56:18 %S A030366 2,6,7,8,12,17,19,26,27,29,33,34,36,37,41,42,43,44,48,55,57,60,68,69, %T A030366 73,74,77,79,84,87,90,97,98,99,102,104,105,106,112,113,117,122,129, %U A030366 132,133,135,138,145,152,153,154,157,158,160,162 %N A030366 Position of n-th 2 in A030363. %K A030366 nonn %O A030366 1,1 %A A030366 _Clark Kimberling_