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 A026267 #4 Mar 30 2012 18:56:05 %S A026267 1,2,3,4,5,6,8,11,13,7,9,10,12,17,20,21,22,23,14,15,16,18,19,28,30,32, %T A026267 35,37,24,25,26,27,41,43,44,45,46,29,31,33,34,36,52,54,56,59,60,38,39, %U A026267 40,42,65,67,68,69,70,47,48,49,50,51,76,78 %N A026267 a(n) = position of n in A026266. %K A026267 nonn %O A026267 1,2 %A A026267 _Clark Kimberling_