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%I #4 Jan 19 2013 20:47:14
%S 2,72,1930,47976,1196232,29856238,745144793,18597229593,464150326595,
%T 11584303335876,289122180321148,7215940813826595,180096192359343564,
%U 4494859317429619337,112183162016821282782,2799878918782194289254
%N Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns
%C Column 3 of A221551
%H R. H. Hardin, <a href="/A221549/b221549.txt">Table of n, a(n) for n = 1..150</a>
%e Some solutions for n=3
%e ..1..0..0....0..2..1....1..1..0....0..1..0....2..1..0....1..0..2....2..1..0
%e ..1..1..1....0..3..2....0..2..1....1..3..1....0..2..0....1..2..2....0..0..1
%e ..1..4..0....0..0..1....2..1..1....2..0..1....2..2..0....0..1..0....1..4..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 19 2013
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