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 A026340 #4 Mar 30 2012 18:56:06 %S A026340 2,5,7,10,13,14,17,19,23,25,28,31,32,34,37,40,41,44,46,50,53,55,58,59, %T A026340 64,65,68,71,73,74,77,79,82,85,86,91,92,94,95,100,101,104,106,109,113, %U A026340 115,118,121,122,125,127,131,133,134,136,140 %N A026340 a(n) = greatest k such that s(k) = n, where s = A026338. %K A026340 nonn %O A026340 1,1 %A A026340 _Clark Kimberling_