A267276 Decimal representation of the n-th iteration of the "Rule 118" elementary cellular automaton starting with a single ON (black) cell.

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

Offset

0,2

References

S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.

Links

Robert Price, Table of n, a(n) for n = 0..1000

A. J. Macfarlane, Generating functions for integer sequences defined by the evolution of cellular automata..., Fig 1.

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton

S. Wolfram, A New Kind of Science

Index entries for sequences related to cellular automata

Index to Elementary Cellular Automata

Formula

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

Mathematica

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 *)

Crossrefs

Cf. A071034.

Sequence in context: A070976 A249608 A265281 * A328713 A376907 A096321

Adjacent sequences: A267273 A267274 A267275 * A267277 A267278 A267279

Keyword

nonn

Author

Robert Price, Jan 12 2016

Status

approved