

A118108


Decimal representation of nth 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



