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 A003189 #18 Oct 14 2019 04:29:36 %S A003189 1,1,1,2,6,156,7013488,29288387523484992, %T A003189 234431745534048922731115019069056 %N A003189 Erroneous version of A051240. %H A003189 E. M. Palmer, <a href="http://dx.doi.org/10.1016/0012-365X(73)90069-1">On the number of n-plexes</a>, Discrete Math., 6 (1973), 377-390. %K A003189 dead %O A003189 1,4