1,2

Starting population for n is n^2.

a(n)=0 for n={1,4,8,12,15,20,..?..}, meaning that after a particular, finite number of generations, the grid is forever empty.

a(n) reaches a nonempty, single static state after a particular, finite number of generations for n={2,5,6,10,13,14,16,18,22,24,26,27,28,..?..}.

a(n) enters a constant population, infinite, two-state and closed loop after a particular, finite number of generations for n={3,7,9,11,17,19,21,23,25,..?..}.

For even generations > 153, a(29)=128. For odd generations > 153, a(29)=120. n=29 is the first value of a(n) for which the system enters a two-state loop with variable population after a particular, finite number of generations.

Eric Weisstein. "Life."

a(5)=24 because a 5 X 5 solid square placed on an otherwise empty grid at generation 0 in Conway's Game of Life will enter a static state at generation 11 with 24 cells forever alive/active/on.

Sequence in context: A092658 A113314 A014458 this_sequence A144207 A016487 A104063

Adjacent sequences: A099730 A099731 A099732 this_sequence A099734 A099735 A099736

nonn

Joseph Biberstine (jrbibers(AT)indiana.edu), Nov 08 2004