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%I #3 Jan 25 2013 11:43:52
%S 0,55,840,15936,252538,4781652,76353254,1402260000,23429257696
%N Number of nX7 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns
%C Column 7 of A221787
%e Some solutions for n=3
%e ..0..2..2..1..0..2..1....0..2..2..1..2..2..1....0..2..2..2..2..1..0
%e ..0..2..1..0..1..1..0....0..1..0..0..1..2..0....0..1..1..2..1..1..0
%e ..1..1..2..1..1..2..0....1..2..1..1..1..1..0....0..0..1..1..2..2..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 25 2013
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