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 A058881 #1 May 16 2003 03:00:00 %S A058881 1,1,7,137 %N A058881 Erroneous version of A051504. %D A058881 F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 220. %K A058881 dead %O A058881 1,3