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 A047834 #2 Dec 06 2006 03:00:00 %S A047834 1,3,10,70,709,47960 %N A047834 Another erroneous version of A002499. %K A047834 dead %O A047834 1,2