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 A026248 #4 Mar 30 2012 18:56:05 %S A026248 1,3,4,7,2,10,13,14,5,6,18,21,8,9,25,26,11,12,30,33,34,15,37,38,41,16, %T A026248 17,45,46,19,20,50,53,22,23,57,58,61,24,64,67,68,27,71,72,75,28,29,79, %U A026248 80,31,32,84,87,88,35,91,92,95,36,98,101,102 %N A026248 a(n) = position of n in A026247. %K A026248 nonn %O A026248 1,2 %A A026248 _Clark Kimberling_