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 A303645 #73 Aug 31 2022 13:02:30 %S A303645 1,2,3,4,5,6,8,9,7,10,12,15,16,18,14,20,24,27,21,25,30,32,36,11 %N A303645 Duplicate of A064364. %K A303645 dead %O A303645 1,2