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 A323933 #6 Feb 16 2023 14:54:52 %S A323933 1,1,2,5,12,36,116,411,1489,5572,21115,81121 %N A323933 Erroneous version of A038142. %K A323933 dead %O A323933 1,3