A166476 Number of stable n-celled patterns ("still lifes") in the 2x2 (B36/S125) cellular automaton.

0, 2, 1, 3, 4, 9, 10, 27, 48, 126

Offset

1,2

Comments

Counts only distinct strict still lifes; reflections and rotations are removed. Pseudo-still lifes (e.g., patterns made up of two disjoint still lifes) are not counted.

Links

Table of n, a(n) for n=1..10.

LifeWiki, 2x2

Example

a(3) = 1 because there is only one distinct still life with three cells: a diagonal line of length three.

Crossrefs

Cf. A019473

Sequence in context: A019612 A007444 A332309 * A052950 A086851 A001054

Adjacent sequences: A166473 A166474 A166475 * A166477 A166478 A166479

Keyword

hard,more,nonn

Author

Nathaniel Johnston, Oct 14 2009

Status

approved