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 A246311 Number of ON cells at generation n of 2-D 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS This is the Rule 60 outer totalistic 8-neighbor 2-D CA. The first few generations are easy to understand, but then there are complications (hence the keyword "look", which refers to the illustrations). LINKS 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

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Last modified April 12 22:36 EDT 2021. Contains 342933 sequences. (Running on oeis4.)