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A266979
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Binary representation of the n-th iteration of the "Rule 79" elementary cellular automaton starting with a single ON (black) cell.
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2
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1, 110, 101, 1111010, 10101, 11111101010, 1010101, 111111110101010, 101010101, 1111111111010101010, 10101010101, 11111111111101010101010, 1010101010101, 111111111111110101010101010, 101010101010101, 1111111111111111010101010101010, 10101010101010101
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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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FORMULA
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Conjectures from Colin Barker, Jan 08 2016 and Apr 18 2019: (Start)
a(n) = 10101*a(n-2)-1010100*a(n-4)+1000000*a(n-6) for n>5.
G.f.: (1+110*x-10000*x^2-100*x^3-100000*x^5) / ((1-x)*(1+x)*(1-10*x)*(1+10*x)*(1-100*x)*(1+100*x)).
(End)
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MATHEMATICA
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rule=79; 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]]], {k, 1, rows}] (* Binary 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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EXTENSIONS
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STATUS
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approved
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