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 A113577 #24 Feb 12 2023 13:37:54 %S A113577 3,23,3323,3233323 %N A113577 Erroneous version of A347680. %K A113577 dead %O A113577 1,1