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%I #3 Jan 02 2013 12:40:09
%S 1,987,118472,16436223,2152770692,282454178707,36946896429843,
%T 4831791752404317,631836540867287034,82621661239567004631
%N Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor
%C Row 4 of A221125
%e Some solutions for n=3
%e ..0..1..0....1..2..1....2..1..0....1..1..0....1..2..1....0..2..1....1..2..0
%e ..2..1..0....1..1..0....0..1..1....2..1..0....0..0..1....0..3..1....1..3..1
%e ..3..1..0....2..0..0....3..2..0....3..1..1....3..1..2....0..1..1....0..0..1
%e ..2..2..0....0..4..0....1..1..0....0..0..2....0..1..0....1..1..1....0..1..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 02 2013
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