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%I #4 Jan 01 2013 08:45:10
%S 0,64,3024,279841,20489472,1572836281,118704053710,8994906720801,
%T 680750019301486,51538469967056164,3901482828808418205,
%U 295352521055213734564,22358767209627320059672,1692606840605154489536964
%N Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor
%C Row 4 of A221087
%H R. H. Hardin, <a href="/A221090/b221090.txt">Table of n, a(n) for n = 1..24</a>
%e Some solutions for n=3
%e ..1..3..0....0..1..0....1..3..1....0..3..1....0..3..1....0..1..1....0..2..2
%e ..0..2..1....2..3..0....0..1..1....0..2..0....1..1..1....0..4..0....0..3..1
%e ..0..2..2....0..2..1....0..2..0....2..1..1....0..2..1....1..0..2....0..0..0
%e ..0..1..0....1..2..0....0..2..1....0..2..0....0..2..0....0..3..0....0..3..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 01 2013
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