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A160416
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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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3
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..9.
David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
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EXAMPLE
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If we label the generations of cells turned ON by consecutive numbers we get the cell pattern shown below:
..9...9...9...9...9
...888.888.888.888.
...878.878.878.878.
...886668666866688.
..9..656.656.656..9
...886644464446688.
...878.434.434.878.
...886644222446688.
..9..656.212.656..9
000000000022446688.
0000000000.434.878.
000000000064446688.
000000000056.656..9
000000000066866688.
0000000000.878.878.
0000000000.888.888.
00000000009...9...9
0000000000.........
0000000000.........
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CROSSREFS
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Cf. A139250, A139251, A152980, A153006, A160117, A160118, A160410, A160412, A160414.
Cf. A160796, A161417. [From Omar E. Pol, Jun 14 2009]
Sequence in context: A029615 A051791 A160796 * A056873 A192427 A166673
Adjacent sequences: A160413 A160414 A160415 * A160417 A160418 A160419
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol, May 20 2009, Jun 14 2009
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STATUS
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approved
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