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%I #4 Jan 12 2013 06:53:34
%S 0,292,18738,1388784,93433746,6308646549,423812250312,28479671473807,
%T 1913505400121105,128574419200721801,8639424408948675486,
%U 580522160326792409378,39007927353168721454490,2621116666944612733670859
%N Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2
%C Column 4 of A221361
%H R. H. Hardin, <a href="/A221359/b221359.txt">Table of n, a(n) for n = 1..50</a>
%e Some solutions for n=3
%e ..1..1..2..1....0..1..2..0....1..2..2..1....1..1..2..1....1..1..1..2
%e ..1..0..1..1....2..0..1..1....0..2..0..1....1..1..1..2....1..0..2..2
%e ..1..2..1..0....2..0..2..1....1..0..1..1....1..0..1..0....0..1..0..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 12 2013
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