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 A087067 #7 Jan 24 2018 14:23:42 %S A087067 0,1,2,3,5,6,8,9,10,12,14,15,17,18,19,21,22,23,26,27,28,30,31,32,34, %T A087067 35,36,39,41,42,44 %N A087067 Incorrect version of A004128. %K A087067 dead %O A087067 0,3