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%I
%S 1,7,17,119,273,1911,4369,30583,69905,489335,1118481,7829367,17895697,
%T 125269879,286331153,2004318071,4581298449,32069089143,73300775185,
%U 513105426295,1172812402961,8209686820727,18764998447377
%N Decimal representation of n-th iteration of the Rule 54 elementary cellular automaton starting with a single black cell.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Rule54.html">Rule 54</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a>
%F a(n odd) = 7(4^(n+1)-1)/5, a(n even) = (4^(n+2)-1)/15
%e 1; 1, 1, 1; 1, 0, 0, 0, 1; 1, 1, 1, 0, 1, 1, 1; 1, 0, 0, 0, 1, 0, 0, 0, 1; ...
%Y Cf. A118109.
%K nonn,tabf
%O 0,2
%A _Eric W. Weisstein_, Apr 13, 2006
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