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 A016013 #14 Dec 26 2018 14:01:23 %S A016013 2,1,2,4,8,6,32,64,12,256,512,24,2048,36,30,16384,32768,96,72,262144, %T A016013 192,1,2 %N A016013 Probably an erroneous version of A016017. %K A016013 dead %O A016013 1,1