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 A169700 #5 May 04 2016 19:05:38 %S A169700 4,7,13,3,28,0,57,-53,60,0,120,-120,120,0,241,-357,124,0,248,-248,248, %T A169700 0,496,-744,248,0,496,-496,496,0,993,-1733,252,0,504,-504,504,0,1008, %U A169700 -1512,504,0,1008,-1008,1008,0,2016,-3528,504,0,1008,-1008,1008,0,2016,-3024,1008,0,2016,-2016 %N A169700 First differences of A169699. %H A169700 Robert Price, <a href="/A169700/b169700.txt">Table of n, a(n) for n = 0..127</a> %K A169700 sign %O A169700 0,1 %A A169700 _N. J. A. Sloane_, Apr 17 2010