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 A267011 #11 Jan 30 2018 09:56:01 %S A267011 0,0,1,0,1,1,3,2,12,14,50,97,312,744,2291 %N A267011 Duplicate of A258206. %K A267011 dead %O A267011 1,7