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A267276
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Decimal representation of the n-th iteration of the "Rule 118" elementary cellular automaton starting with a single ON (black) cell.
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1
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1, 7, 19, 123, 283, 1883, 5083, 30939, 72411, 483035, 1296091, 7919323, 18544347, 123614939, 331790043, 2027402971, 4747015899, 31645349595, 84938700507, 519012464347, 1215235471067, 8101213091547, 21744285759195, 132867186079451, 311100309354203
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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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Empirical g.f.: (1+6*x+12*x^2+96*x^3-144*x^4-32*x^5-704*x^6) / ((1-x)*(1-2*x)*(1-4*x)*(1+4*x)*(1+2*x+4*x^2)*(1+16*x^2)). - Colin Barker, Jan 14 2016 and Apr 19 2019
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MATHEMATICA
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rule=118; 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
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AUTHOR
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STATUS
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approved
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