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 A206398 #19 Sep 19 2015 18:08:09 %S A206398 1,2,3,4,6,6,12,15,20,30,30,60,60,84,105,140,210,210,420,420,420,420, %T A206398 840,840,1260,1260,1540,2310,2310,4620,4620,5460,5460,9240,9240,13860, %U A206398 13860,16380,16380,20020,30030,30030,60060,60060,60060,60060,120120,120120,180180 %N A206398 Erroneous version of A000793. %K A206398 dead %O A206398 1,2