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 A026195 #4 Mar 30 2012 18:56:05 %S A026195 1,2,3,9,4,5,15,6,7,21,8,25,27,10,11,33,12,13,39,14,43,45,16,17,51,18, %T A026195 19,57,20,61,63,22,23,69,24,73,75,26,79,81,28,29,87,30,31,93,32,97,99, %U A026195 34,35,105,36,37,111,38,115,117,40,41,123,42 %N A026195 a(n) = position of n in A026194. %K A026195 nonn %O A026195 1,2 %A A026195 _Clark Kimberling_