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 A037163 #1 Dec 11 1999 03:00:00 %S A037163 1,2,2,4,6,12,20,39,71,137,261,511,995,1974,3915,7841,15749,31835 %N A037163 Erroneous version of A001679. %K A037163 dead %O A037163 0,2