A151776 - OEIS

A151776

Number of ON states after n generations of cellular automaton based on f.c.c. lattice with each cell adjacent to its twelve neighbors.

0, 1, 13, 25, 109, 121, 205, 385, 805, 817, 901, 1081, 1645, 2185, 2605, 3721, 5749, 5857, 5941, 6121, 6685, 7225, 7789, 9289, 12565, 14401, 14821, 15937, 18877, 23257, 25981, 32233, 42445, 43729, 44101, 44521

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OFFSET

0,3

COMMENTS

We take the f.c.c. lattice to consist of the points (X,Y,Z) of Z^3 with X+Y+Z even.

We start with a single ON cell at the origin.

A cell is turned ON if exactly one of its twelve neighbors is ON. An ON cell remains ON forever.

Analog of A147562, which is corresponding sequence for the square lattice Z^2.

If we just look at what happens in the (X,Y)-plane, we get A147552 and A151836.

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 0..68

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]

Nathaniel Johnston, C script

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Index entries for sequences related to f.c.c. lattice

CROSSREFS

Cf. A151777, A151778, A147562, A151725, A139250.

Sequence in context: A298037 A283255 A322662 * A301327 A116524 A053404

Adjacent sequences: A151773 A151774 A151775 * A151777 A151778 A151779

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 24 2009

EXTENSIONS

Terms after a(30) from Nathaniel Johnston, Mar 27 2011

STATUS

approved