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%I #4 Jan 17 2013 17:24:40
%S 1,73,1407,34751,865318,21576814,538159483,13422938865,334800425933,
%T 8350733876991,208287552769998,5195196692208296,129580804689787280,
%U 3232059523406689453,80615402781266738787,2010743650758352091582
%N Number of nX4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction
%C Column 4 of A221483
%H R. H. Hardin, <a href="/A221479/b221479.txt">Table of n, a(n) for n = 1..25</a>
%e Some solutions for n=3
%e ..0..1..2..1....1..2..0..0....0..3..0..0....0..2..0..0....0..2..0..1
%e ..1..1..2..2....1..2..3..1....1..2..2..1....1..1..1..2....1..1..2..0
%e ..0..1..1..0....0..0..1..1....1..0..2..0....2..1..2..0....1..1..2..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 17 2013
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