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 A074168 #11 Dec 02 2020 16:45:31 %S A074168 1,2,6,30,6,210,6,2310,2730,30,39270,7410,42,7590,46410,1272810,30, %T A074168 930930,82110,6,21111090,1230,48969690 %N A074168 Duplicate of A076978. %K A074168 dead %O A074168 0,2