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 A133227 #11 Sep 23 2024 07:31:07 %S A133227 1,3,15,15,105,105 %N A133227 Incorrect duplicate of A133221. %K A133227 dead %O A133227 1,2