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A118108 Decimal representation of n-th iteration of the Rule 54 elementary cellular automaton starting with a single black cell. 2
1, 7, 17, 119, 273, 1911, 4369, 30583, 69905, 489335, 1118481, 7829367, 17895697, 125269879, 286331153, 2004318071, 4581298449, 32069089143, 73300775185, 513105426295, 1172812402961, 8209686820727, 18764998447377 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

Eric Weisstein's World of Mathematics, Rule 54

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton

FORMULA

a(n odd) = 7(4^(n+1)-1)/5, a(n even) = (4^(n+2)-1)/15

EXAMPLE

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; ...

CROSSREFS

Cf. A118109.

Sequence in context: A205989 A063384 A165246 * A227506 A244279 A214149

Adjacent sequences:  A118105 A118106 A118107 * A118109 A118110 A118111

KEYWORD

nonn,tabf,base

AUTHOR

Eric W. Weisstein, Apr 13, 2006

STATUS

approved

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Last modified December 20 04:40 EST 2014. Contains 252241 sequences.