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A122108 a(n)=number of 1's ("live" cells) at stage n of a 2-dimensional cellular automaton evolving by the rule: 1 if N+S+E+W is 1 or 2, else 0, starting from a single live cell. 5
1, 4, 8, 12, 20, 24, 44, 28, 52, 56, 104, 56, 104, 112, 212, 60, 116, 120, 232, 120, 232, 240, 464, 120, 232, 240, 464, 240, 464, 480, 932, 124, 244, 248, 488, 248, 488, 496, 976, 248, 488, 496, 976, 496, 976, 992, 1952, 248, 488, 496, 976, 496, 976, 992, 1952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

Index entries for sequences related to cellular automata

CROSSREFS

Cf. A048883.

Sequence in context: A090658 A268799 A269711 * A123723 A279227 A261649

Adjacent sequences:  A122105 A122106 A122107 * A122109 A122110 A122111

KEYWORD

nonn

AUTHOR

John W. Layman, Oct 18 2006

STATUS

approved

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Last modified February 23 17:41 EST 2018. Contains 299584 sequences. (Running on oeis4.)