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 A087326 #4 Jun 02 2025 00:16:34 %S A087326 1,4,20,20,714,714,25550,90180,142803,809300 %N A087326 Erroneous version of A075031. %K A087326 dead %O A087326 1,2