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 A026203 #4 Mar 30 2012 18:56:05 %S A026203 1,2,6,3,4,12,5,16,18,7,8,24,9,10,30,11,34,36,13,14,42,15,46,48,17,52, %T A026203 54,19,20,60,21,22,66,23,70,72,25,26,78,27,28,84,29,88,90,31,32,96,33, %U A026203 100,102,35,106,108,37,38,114,39,40,120,41 %N A026203 position of n in A026202. %K A026203 nonn %O A026203 1,2 %A A026203 _Clark Kimberling_