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A079315 Number of cells that change from OFF to ON at stage n of the cellular automaton described in A079317. +0
8
0, 1, 4, 4, 12, 4, 20, 12, 44, 4, 52, 12, 76, 12, 100, 36, 172, 4, 180, 12, 204, 12, 228, 36, 300, 12, 324, 36, 396, 36, 468, 108, 684, 4, 692, 12, 716, 12, 740, 36, 812, 12, 836, 36, 908, 36, 980, 108, 1196, 12, 1220, 36, 1292, 36, 1364, 108, 1580, 36, 1652, 108, 1868 (list; graph; listen)
OFFSET

0,3

COMMENT

Start with cell (0,0) ON; at each succeeding stage the cells that share exactly one edge with an active cell change their state.

This is not the CA discussed by Singmaster in the reference given in A079314. That was an error based on my misreading of the paper. - N. J. A. Sloane, Aug 05 2009

FORMULA

a(2n+1) = A147582(n+1), a(2n) = A151914(n).

CROSSREFS

Cf. A079316-A079319, A147582, A151914, A151917, A151920, A151921, A139250.

Sequence in context: A147582 A162793 A109045 this_sequence A121189 A136485 A157617

Adjacent sequences: A079312 A079313 A079314 this_sequence A079316 A079317 A079318

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Feb 12 2003

EXTENSIONS

More terms from John W. Layman (layman(AT)math.vt.edu), Oct 30 2003

Edited by N. J. A. Sloane, Aug 05 2009

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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