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A118108
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Decimal representation of n-th iteration of the Rule 54 elementary cellular automaton starting with a single black cell.
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2
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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; internal format)
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OFFSET
| 0,2
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LINKS
| Eric Weisstein's World of Mathematics, Rule 54
Eric Weisstein's World of Mathematics, Elementary Cellular Automaton
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FORMULA
| a(n odd) = 7(4^(n+1)-1)/5, a(n even) = (4^(n+2)-1)/15
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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; ...
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CROSSREFS
| Cf. A118109.
Sequence in context: A067185 A063384 A165246 * A147643 A061159 A178694
Adjacent sequences: A118105 A118106 A118107 * A118109 A118110 A118111
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KEYWORD
| nonn,tabf
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), Apr 13, 2006
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