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A118175
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Binary representation of n-th iteration of the Rule 220 elementary cellular automaton starting with a single black cell.
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2
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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, 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, 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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Contribution from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jul 05 2009: (Start)
Divided into rows of length 2n, row n consists of n 1's followed by n 0's.
Characteristic function of A061885, 1-based characteristic function of A004201. (End)
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LINKS
| Eric Weisstein's World of Mathematics, Rule 220
Eric Weisstein's World of Mathematics, Elementary Cellular Automaton
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FORMULA
| a(n) = 1 - A079813(n+1). - DELEHAM Philippe, Jan 02 2012
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EXAMPLE
| 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; ...
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CROSSREFS
| Cf. A083420.
Sequence in context: A108882 A168002 A070829 * A179762 A120526 A086694
Adjacent sequences: A118172 A118173 A118174 * A118176 A118177 A118178
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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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