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 A024497 #3 Jun 29 2008 03:00:00 %S A024497 3,6,28,165,1092,7752,57684,444015,3506100,28242984,231180144, %T A024497 1917334783 %N A024497 Duplicate of A007228. %K A024497 dead %O A024497 1,1