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 A151929 #7 Oct 07 2013 09:39:19
%S A151929 1,2,0,3,-2,5,-4,7,-5,5,-1,3,-2,7,-6,9,-7,4,1,4,-3,2,0,5,-2,1,-1,7,-3,
%T A151929 4,-3,8,-13,13,-10,17,-14,12,-6,7,2,-6,4,4,-11,17,-13,9,-7,9,-10,16,
%U A151929 -7,8,-11,16,-8,3,-4,13,-8,9,-11,19,-14,-8,9,4,0,-2,10,1,-5,-5,15,-5,0,9,-7,6,2,-9,2,13,-13,20,-23,10,3,-5,0,27,-34,22
%N A151929 First differences of A070952.
%C A151929 Net increase in number of ON cells at generation n of 1-D CA using Rule 30.
%H A151929 N. J. A. Sloane, <a href="/A151929/b151929.txt">Table of n, a(n) for n = 0..10000</a> (Added Aug 15 2009)
%H A151929 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>
%t A151929 steps = 100; Join[{1}, Total /@ CellularAutomaton[30, {{1}, 0}, steps] // Differences] (* _Jean-François Alcover_, Oct 07 2013 *)
%K A151929 sign
%O A151929 0,2
%A A151929 _N. J. A. Sloane_, Aug 10 2009