A175000 Number of stable n-celled patterns ("still lifes") in the HighLife (B36/S23) cellular automaton.

0, 0, 0, 2, 1, 4, 4, 9, 9, 25, 44, 111, 218

Offset: 1

Author

Christian Schroeder, Apr 03 2010

Keywords

• hard
• more
• nonn

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.

Examples

			a(4)=2 because there are only two still-lives with four cells: the block (a 2x2 block) and the tub (four cells bordering all four sides of an empty spot).
		

Links

• LifeWiki, HighLife

Crossrefs

Cf. A019473, A166476