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%I #4 Feb 07 2013 05:47:32
%S 21,3034,439979,62776264,8938090933,1272224461900,181075284907525,
%T 25772100415484857,3668085288770478139,522070083851345084353,
%U 74305016748179915810183,10575659301127035698958882
%N Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns
%C Row 4 of A222093
%H R. H. Hardin, <a href="/A222096/b222096.txt">Table of n, a(n) for n = 1..27</a>
%e Some solutions for n=3
%e ..0..0..1....0..0..0....0..1..0....0..0..0....0..1..0....0..1..0....0..0..1
%e ..2..0..1....4..0..2....3..0..4....2..1..1....2..0..2....2..0..1....1..2..0
%e ..3..0..2....0..0..2....0..3..0....0..1..1....3..1..2....0..3..0....2..1..0
%e ..1..0..2....1..2..1....0..1..0....3..2..1....0..0..1....2..0..3....3..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 07 2013
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