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 A026205 #4 Mar 30 2012 18:56:05 %S A026205 2,1,5,3,7,9,11,4,13,14,16,18,20,6,22,8,24,26,28,10,31,32,34,36,38,12, %T A026205 41,42,44,46,48,15,50,17,52,54,56,19,59,60,62,64,66,21,69,70,72,74,76, %U A026205 23,78,25,80,82,84,27,87,29,89,91,93,30,95 %N A026205 a(n) = position of n in A026204. %K A026205 nonn %O A026205 1,1 %A A026205 _Clark Kimberling_