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.

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

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: A268799 A359955 A269711 * A311658 A311659 A311660

Adjacent sequences: A122105 A122106 A122107 * A122109 A122110 A122111

Keyword

nonn

Author

John W. Layman, Oct 18 2006

Status

approved