A122108 - OEIS

%I #4 Feb 04 2015 15:26:22

%S 1,4,8,12,20,24,44,28,52,56,104,56,104,112,212,60,116,120,232,120,232,

%T 240,464,120,232,240,464,240,464,480,932,124,244,248,488,248,488,496,

%U 976,248,488,496,976,496,976,992,1952,248,488,496,976,496,976,992,1952

%N 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.

%H <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>

%Y Cf. A048883.

%K nonn

%O 1,2

%A _John W. Layman_, Oct 18 2006