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%I #4 Jan 26 2013 05:54:52
%S 1,39,207,3074,26770,308070,3072428,33022374,341503872,3603418695,
%T 37628839684,395070947793,4136321868326,43369462014426,
%U 454388947033525,4762556310357090,49907461663171892,523040952733010374
%N Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns
%C Column 4 of A221800
%H R. H. Hardin, <a href="/A221797/b221797.txt">Table of n, a(n) for n = 1..48</a>
%e Some solutions for n=3
%e ..0..1..1..2....0..2..1..1....0..2..0..2....1..1..1..2....1..1..1..1
%e ..1..2..0..1....1..2..0..1....1..1..1..1....2..1..0..1....1..2..0..1
%e ..1..1..1..1....1..1..1..1....2..0..2..0....1..0..1..1....0..1..1..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 26 2013
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