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A267607
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Decimal representation of the n-th iteration of the "Rule 181" elementary cellular automaton starting with a single ON (black) cell.
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1
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1, 3, 11, 59, 171, 1019, 3051, 15291, 43691, 262139, 786411, 3932091, 11271851, 66845691, 200010731, 1002159035, 2863311531, 17179869179, 51539607531, 257698037691, 738734374571, 4380866640891, 13108240182251, 65678639872955, 187655711009451
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OFFSET
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0,2
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REFERENCES
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S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.
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LINKS
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MATHEMATICA
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rule=181; rows=20; ca=CellularAutomaton[rule, {{1}, 0}, rows-1, {All, All}]; (* Start with single black cell *) catri=Table[Take[ca[[k]], {rows-k+1, rows+k-1}], {k, 1, rows}]; (* Truncated list of each row *) Table[FromDigits[catri[[k]], 2], {k, 1, rows}] (* Decimal Representation of Rows *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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