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A188343
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Number of "ON" cells at n-th stage in simple 2-dimensional cellular automaton (see Comments for precise definition).
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2
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0, 1, 9, 13, 41, 45, 73, 85, 169, 173, 201, 213, 297, 317, 441, 485, 681, 685, 713, 725, 809, 829, 953, 997, 1193, 1213, 1353, 1397, 1689, 1773, 2201, 2309, 2737, 2765, 2817, 2845, 2953, 2989, 3113
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OFFSET
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0,3
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COMMENTS
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On the infinite square grid, we start at stage 0 with all square cells in the OFF state.
At stage 1 we turn ON a single cell in the central position.
For n>1, if n is even, at stage n we turn ON all the OFF neighboring cells from cells that were turned ON at stage n-1.
For n>1, if n is odd, at stage n we turn ON all the OFF cells that have exactly one neighbor that was turned ON at stage n-1.
First differs from A160118 at a(13).
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LINKS
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FORMULA
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For n even, use Generations rule "/12345678/250". For n odd, use Generations rule "/1/250".
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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