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 A046690 #5 May 11 2007 03:00:00 %S A046690 1,2,2,8,12,5,42,84,56,14,262,640,580,240,42,1828,5236,5894,3344,990 %N A046690 Duplicate of A008828. %K A046690 dead %O A046690 1,2