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 A091525 #3 Nov 10 2007 03:00:00 %S A091525 1,1,2,2,3,4,3,5,4,6,7,5,8,6,9,7,10,11,8,12,9,13,14,10,15,11,16,12,17 %N A091525 Duplicate of A091524. %K A091525 dead %O A091525 1,3