%I A118175
%S A118175 1,0,1,1,0,0,1,1,1,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,
%T A118175 1,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
%U A118175 0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0
%N A118175 Binary representation of n-th iteration of the Rule 220 elementary cellular 
               automaton starting with a single black cell.
%C A118175 Contribution from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), 
               Jul 05 2009: (Start)
%C A118175 Divided into rows of length 2n, row n consists of n 1's followed by n 
               0's.
%C A118175 Characteristic function of A061885, 1-based characteristic function of 
               A004201. (End)
%H A118175 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Rule220.html">Rule 220</a>
%H A118175 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               ElementaryCellularAutomaton.html">Elementary Cellular Automaton</
               a>
%e A118175 1; 0, 1, 1; 0, 0, 1, 1, 1; 0, 0, 0, 1, 1, 1, 1; 0, 0, 0, 0, 1, 1, 1, 
               1, 1; ...
%Y A118175 Cf. A083420.
%Y A118175 Sequence in context: A137893 A108882 A070829 this_sequence A120526 A086694 
               A093317
%Y A118175 Adjacent sequences: A118172 A118173 A118174 this_sequence A118176 A118177 
               A118178
%K A118175 nonn,tabf
%O A118175 0,1
%A A118175 Eric Weisstein (eric(AT)weisstein.com), Apr 13, 2006