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 A204824 #10 Jun 21 2020 15:26:29 %S A204824 18,36,72,100,144,162,196,200,288,324,392,400,450,576,648,784,800,882, %T A204824 900,968,1152,1296,1352,1458,1568,1600,1764,1800,1936,2178,2304,2450, %U A204824 2500,2592,2704,2916,3042,3136,3200,3528,3600,3872,4050,4356,4608,4624,4900,5000 %N A204824 Duplicate of A156903. %K A204824 dead %O A204824 1,1