A221307 - OEIS

%I #3 Jan 09 2013 16:37:22

%S 0,90,0,38146,0,19642342,0,9842336697,0,4907450696408,0,

%T 2441328266555768,0,1213489893520857350,0,602992641919618581949,0,

%U 299597420150822374508346,0,148848899893861061853934856,0

%N Number of nX5 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two

%C Column 5 of A221308

%e Some solutions for n=4

%e ..0..0..0..2..2....0..2..0..0..0....0..0..2..0..0....2..2..0..2..0

%e ..2..2..0..0..0....0..2..0..2..0....2..2..2..2..0....0..0..0..2..2

%e ..0..0..2..2..0....2..2..2..2..0....0..0..0..2..2....0..0..0..0..2

%e ..2..2..2..2..0....0..2..0..2..2....0..2..2..0..2....2..2..2..2..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 09 2013