

A246311


Number of ON cells at generation n of 2D cellular automaton in which a cell is ON iff either 1 or 2 of its eight neighbors were ON at previous generation, starting with a single ON cell.


1



1, 8, 16, 24, 28, 56, 68, 88, 112, 116, 148, 216, 232, 260, 400, 320, 420, 440, 508, 472, 512, 564, 752, 684, 876, 896, 1064, 1064, 1224, 1368, 1620, 1396, 1564, 1612, 1756, 1632, 1976, 1676, 2008, 1848, 2016, 2080, 2332, 2004, 2488, 2332, 2988, 2516, 2868, 3008, 3184, 2956, 3476, 3432, 3556, 3532, 4008, 4116, 4676, 4308, 4984, 5044, 6044, 5148, 5780, 5780, 6200
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OFFSET

0,2


COMMENTS

This is the Rule 60 outer totalistic 8neighbor 2D CA.
The first few generations are easy to understand, but then there are complications (hence the keyword "look", which refers to the illustrations).


LINKS

Table of n, a(n) for n=0..66.
N. J. A. Sloane, Illustration of first 28 generations


MATHEMATICA

Total@*Total /@ CellularAutomaton[{60, {2, {{2, 2, 2}, {2, 1, 2}, {2, 2, 2}}}, {1, 1}}, {{{1}}, 0}, 66]
ArrayPlot /@ CellularAutomaton[{60, {2, {{2, 2, 2}, {2, 1, 2}, {2, 2, 2}}}, {1, 1}}, {{{1}}, 0}, 28]


CROSSREFS

Sequence in context: A046099 A033859 A177899 * A244371 A144566 A037989
Adjacent sequences: A246308 A246309 A246310 * A246312 A246313 A246314


KEYWORD

nonn,look


AUTHOR

N. J. A. Sloane, Aug 23 2014


STATUS

approved



