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 A122661 #2 Jan 09 2009 03:00:00 %S A122661 6,15,17,40,49,89,116,199,271,437,580,924,1205,1812,2385,3465,4478, %T A122661 6332,8149,11190,14246 %N A122661 Erroneous version of A007894. %K A122661 dead %O A122661 17,1