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 A283701 Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 710", based on the 5-celled von Neumann neighborhood. 4
 1, 3, 5, 13, 21, 53, 81, 219, 321, 867, 1365, 3413, 5393, 13755, 20481, 55299, 82949, 224781, 345365, 880053, 1393681, 3501627, 5309761, 14388579, 21058837, 56841653, 89477377, 223697795, 353374533, 901266285, 1342455813, 3624853517, 5437132821, 14733948981 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Initialized with a single black (ON) cell at stage zero. REFERENCES S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 170. LINKS Robert Price, Table of n, a(n) for n = 0..126 Robert Price, Diagrams of first 20 stages N. J. A. Sloane, On the Number of ON Cells in Cellular Automata, arXiv:1503.01168 [math.CO], 2015 Eric Weisstein's World of Mathematics, Elementary Cellular Automaton S. Wolfram, A New Kind of Science Wolfram Research, Wolfram Atlas of Simple Programs MATHEMATICA CAStep[rule_, a_] := Map[rule[[10 - #]] &, ListConvolve[{{0, 2, 0}, {2, 1, 2}, {0, 2, 0}}, a, 2], {2}]; code = 710; stages = 128; rule = IntegerDigits[code, 2, 10]; g = 2 * stages + 1; (* Maximum size of grid *) a = PadLeft[{{1}}, {g, g}, 0, Floor[{g, g}/2]]; (* Initial ON cell on grid *) ca = a; ca = Table[ca = CAStep[rule, ca], {n, 1, stages + 1}]; PrependTo[ca, a]; (* Trim full grid to reflect growth by one cell at each stage *) k = (Length[ca[[1]]] + 1)/2; ca = Table[Table[Part[ca[[n]] [[j]], Range[k + 1 - n, k - 1 + n]], {j, k + 1 - n, k - 1 + n}], {n, 1, k}]; Table[FromDigits[Part[ca[[i]] [[i]], Range[1, i]], 2], {i, 1, stages - 1}] CROSSREFS Cf. A283699, A283700, A283702. Sequence in context: A059875 A284357 A283583 * A284538 A086893 A284425 Adjacent sequences:  A283698 A283699 A283700 * A283702 A283703 A283704 KEYWORD nonn,easy AUTHOR Robert Price, Mar 14 2017 STATUS approved

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Last modified January 18 07:00 EST 2022. Contains 350454 sequences. (Running on oeis4.)