%I #4 Nov 03 2024 16:43:03
%S 0,2,1,3,4,9,10,27,48,126
%N Number of stable n-celled patterns ("still lifes") in the 2x2 (B36/S125) cellular automaton.
%C 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.
%H LifeWiki, <a href="https://conwaylife.com/wiki/OCA:2%C3%972">2x2</a>
%e a(3) = 1 because there is only one distinct still life with three cells: a diagonal line of length three.
%Y Cf. A019473
%K hard,more,nonn
%O 1,2
%A _Nathaniel Johnston_, Oct 14 2009