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 A084664 #4 Nov 10 2007 03:00:00 %S A084664 0,1,5,10,25,50,65,100,146,250,405,500,510,521,615,650,768,945,965, %T A084664 1000 %N A084664 Duplicate of A045620. %K A084664 dead %O A084664 1,3