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 A191256 #34 Sep 21 2018 06:20:09 %S A191256 2,6,10,14,16,18,22,26,30,34,38,42,46,48,50,54,58 %N A191256 Duplicate of A067368. %K A191256 dead %O A191256 1,1