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 A100453 #3 Mar 30 2012 16:50:05 %S A100453 1,49,224,720,960 %N A100453 a(n) = smallest number to appear exactly n times in the array A100452. %K A100453 nonn %O A100453 1,2 %A A100453 _N. J. A. Sloane_, Nov 22 2004