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 A088657 #3 Feb 20 2005 03:00:00 %S A088657 0,0,1,1,3,2,7,6,19,16,51,45,141,126,393,357,1107,1016,3139,2907,8953 %N A088657 Except for initial 0, same as A005213. %K A088657 dead %O A088657 0,5