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 A086561 #4 May 11 2007 03:00:00 %S A086561 1,1,4,6,8,23,24,1804,1968,8375,53750,243864,639324,41381620,102621343 %N A086561 Duplicate of A083790. %K A086561 dead %O A086561 1,3