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 A333898 #6 May 03 2020 15:01:53 %S A333898 1,1,3,8,61,800,38194,6254652,3666019207,7400038427299, %T A333898 51429702889968135,1241437835049586937641,105176323921573775380216377, %U A333898 31585284922954071317319026074538 %N A333898 Number of unlabeled loopless multigraphs with n nodes of degree n or less. %Y A333898 Main diagonal of A333893. %K A333898 nonn,more %O A333898 0,3 %A A333898 _Andrew Howroyd_, Apr 09 2020