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Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2
0

%I #3 Jan 11 2013 10:45:19

%S 1,1001,60807,4413085,308965149,22068912649,1581061669545,

%T 113618510899217,8171887820833287,587983789007292695,

%U 42310129466893396913,3044554852614334562897

%N Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2

%C Row 4 of A221345

%e Some solutions for n=3

%e ..2..1..0....2..0..2....1..2..2....1..0..2....1..1..0....1..1..1....0..1..1

%e ..2..0..0....0..0..2....0..1..0....0..1..0....0..2..2....2..2..1....2..0..0

%e ..2..1..1....0..1..1....2..0..2....2..2..1....2..2..0....1..0..0....0..2..1

%e ..0..1..2....1..2..1....0..1..1....1..0..2....0..2..0....1..2..0....2..2..1

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 11 2013