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 A267444 Decimal representation of the middle column of the "Rule 129" elementary cellular automaton starting with a single ON (black) cell. 1
 1, 2, 5, 10, 21, 43, 87, 174, 349, 699, 1399, 2799, 5599, 11199, 22399, 44798, 89597, 179195, 358391, 716783, 1433567, 2867135, 5734271, 11468543, 22937087, 45874175, 91748351, 183496703, 366993407, 733986815, 1467973631, 2935947262, 5871894525, 11743789051 (list; graph; refs; listen; history; text; internal format)
 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 Eric Weisstein's World of Mathematics, Elementary Cellular Automaton S. Wolfram, A New Kind of Science MATHEMATICA rule=129; 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 *) mc=Table[catri[[k]][[k]], {k, 1, rows}]; (* Keep only middle cell from each row *) Table[FromDigits[Take[mc, k], 2], {k, 1, rows}]  (* Binary Representation of Middle Column *) CROSSREFS Cf. A267417. Sequence in context: A032283 A266248 A027437 * A267880 A101510 A066819 Adjacent sequences:  A267441 A267442 A267443 * A267445 A267446 A267447 KEYWORD nonn,easy AUTHOR Robert Price, Jan 15 2016 STATUS approved

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Last modified May 19 20:41 EDT 2019. Contains 323409 sequences. (Running on oeis4.)