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 A160053 #12 Oct 08 2019 09:54:26 %S A160053 0,1,4,8,9,16,17,25,36,40,49,52,64,72,73,80,81,89,97,100,116,121,136 %N A160053 Duplicate of A140612. %K A160053 dead %O A160053 1,3 %A A160053 _Zak Seidov_, May 01 2009