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A255462 Number of ON cells after n generations of the odd-rule cellular automaton defined by OddRule 365 when started with a single ON cell. 2

%I

%S 1,6,6,30,6,36,30,138,6,36,36,180,30,180,138,606,6,36,36,180,36,216,

%T 180,828,30,180,180,900,138,828,606,2586,6,36,36,180,36,216,180,828,

%U 36,216,216,1080,180,1080,828,3636,30,180,180,900,180,1080,900,4140,138,828,828,4140

%N Number of ON cells after n generations of the odd-rule cellular automaton defined by OddRule 365 when started with a single ON cell.

%H Paul Tek, <a href="/A255462/b255462.txt">Table of n, a(n) for n = 0..10000</a>

%H Shalosh B. Ekhad, N. J. A. Sloane, and Doron Zeilberger, <a href="http://arxiv.org/abs/1503.01796">A Meta-Algorithm for Creating Fast Algorithms for Counting ON Cells in Odd-Rule Cellular Automata</a>, arXiv:1503.01796 [math.CO], 2015; see also the <a href="http://www.math.rutgers.edu/~zeilberg/mamarim/mamarimhtml/CAcount.html">Accompanying Maple Package</a>.

%H Shalosh B. Ekhad, N. J. A. Sloane, and Doron Zeilberger, <a href="http://arxiv.org/abs/1503.04249">Odd-Rule Cellular Automata on the Square Grid</a>, arXiv:1503.04249 [math.CO], 2015.

%H N. J. A. Sloane, On the No. of ON Cells in Cellular Automata, Video of talk in Doron Zeilberger's Experimental Math Seminar at Rutgers University, Feb. 05 2015: <a href="https://vimeo.com/119073818">Part 1</a>, <a href="https://vimeo.com/119073819">Part 2</a>

%H N. J. A. Sloane, <a href="http://arxiv.org/abs/1503.01168">On the Number of ON Cells in Cellular Automata</a>, arXiv:1503.01168 [math.CO], 2015

%H N. J. A. Sloane, <a href="/A255462/a255462.png">Illustration of generations 0 to 15</a>

%H N. J. A. Sloane, <a href="/A255462/a255462_3.png">Illustration of generations 0 to 35</a>

%H N. J. A. Sloane, <a href="/A255462/a255462_1.png">Illustration of generation 7</a>

%H N. J. A. Sloane, <a href="/A255462/a255462_2.png">Illustration of generation 15</a>

%H N. J. A. Sloane, <a href="/A255462/a255462.txt">Mathematica notebook to generate this cellular automaton</a>

%H <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>

%F It follows from Theorem 3 of the Fredkin.pdf (2015) paper that this satisfies the recurrence a(2t)=a(t), a(4t+1)=6*a(t), and a(4t+3)=7*a(2t+1)-12*a(t) for t>0, with a(0)=1. - _N. J. A. Sloane_, Mar 10 2015

%e From _Omar E. Pol_, Sep 08 2016: (Start)

%e Written as an irregular triangle in which the row lengths are the terms of A011782 the sequence begins:

%e 1;

%e 6;

%e 6, 30;

%e 6, 36, 30, 138;

%e 6, 36, 36, 180, 30, 180, 138, 606;

%e 6, 36, 36, 180, 36, 216, 180, 828, 30, 180, 180, 900, 138, 828, 606, 2586;

%e ...

%e Right border gives A255463. (End)

%t (* See Mathematica notebook in link *)

%t (* or *)

%t A255462[n_] := Total[CellularAutomaton[{42, {2, {{0, 1, 1}, {1, 1, 0}, {1, 0, 1}}}, {1, 1}}, {{{1}}, 0}, {{{n}}}], 2]; Array[A255462, 60, 0] (* _JungHwan Min_, Sep 06 2016 *)

%t A255462L[n_] := Total[#, 2] & /@ CellularAutomaton[{42, {2, {{0, 1, 1}, {1, 1, 0}, {1, 0, 1}}}, {1, 1}}, {{{1}}, 0}, n]; A255462L[59] (* _JungHwan Min_, Sep 06 2016 *)

%Y Run length transform of A255463.

%K nonn,tabf,look

%O 0,2

%A _N. J. A. Sloane_ and _Doron Zeilberger_, Feb 23 2015

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Last modified October 20 11:09 EDT 2018. Contains 316379 sequences. (Running on oeis4.)