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 A111945 #12 Sep 07 2018 03:49:05 %S A111945 1,1,1,3,3,1,5,3,1,7,5,3,5 %N A111945 Duplicate of A002143. %K A111945 dead %O A111945 1,4