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 A004049 #10 Oct 24 2023 06:17:06 %S A004049 1,1,4,4,8,24,32,40,120,296 %N A004049 Erroneous version of A006967. %K A004049 dead %O A004049 1,3 %A A004049 _N. J. A. Sloane_