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A338097 Number of ON cells after n generations of cellular automaton based on a hexagonal grid and starting with two adjacent ON cells where an OFF cell is turned ON if exactly two of its six neighbors are ON. 2
0, 2, 4, 8, 12, 18, 22, 28, 32, 36, 44, 56, 76, 86, 100, 116, 130, 144, 164, 178, 198, 218, 242, 260, 282, 306, 350, 386, 414, 446, 460, 484, 516, 556, 586, 638, 688, 736, 770, 800, 828, 872, 914, 964, 1012, 1068, 1122, 1162, 1204, 1252, 1300, 1360, 1408, 1462 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

An ON cell remains ON forever.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 0..8192

Rémy Sigrist, Illustration of initial terms

Rémy Sigrist, Illustration of the structure at generation 512

Rémy Sigrist, PARI program for A338097

Index entries for sequences related to cellular automata

PROG

(PARI) See Links section.

CROSSREFS

Cf. A151731 (square grid variant), A338098.

Sequence in context: A046843 A292060 A152125 * A305694 A176562 A337120

Adjacent sequences:  A338094 A338095 A338096 * A338098 A338099 A338100

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Oct 10 2020

STATUS

approved

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Last modified June 19 17:53 EDT 2021. Contains 345144 sequences. (Running on oeis4.)