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%I #4 Jan 25 2013 09:32:20
%S 8,258,7676,230621,6911480,207263892,6215606652,186396173357,
%T 5589718833790,167626605489419,5026850431347057,150747105072411113,
%U 4520661588144287366,135567321024902298286,4065444442439149946284
%N Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns
%C Column 3 of A221780
%H R. H. Hardin, <a href="/A221778/b221778.txt">Table of n, a(n) for n = 1..52</a>
%e Some solutions for n=3
%e ..0..1..1....2..4..0....1..3..0....2..0..1....1..1..1....0..3..0....0..2..2
%e ..2..0..1....0..0..0....0..0..2....0..2..0....1..1..0....1..2..1....1..0..0
%e ..3..0..1....0..1..2....1..1..1....2..1..1....2..0..2....1..0..1....1..0..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 25 2013