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 A026459 #7 Mar 12 2016 04:11:02 %S A026459 1,2,3,5,6,9,11,12,14,15,17,18,19,21,24,27,29,30,33,35,37,38 %N A026459 Erroneous version of A026461. %K A026459 dead %O A026459 1,2