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Number of nX6 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns
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%I #3 Jan 25 2013 11:43:34

%S 0,21,142,1325,13682,109702,1104476,9561346,89663745

%N Number of nX6 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns

%C Column 6 of A221787

%e Some solutions for n=3

%e ..0..2..2..1..0..1....0..2..1..1..1..1....0..2..2..2..1..1....0..2..2..1..1..0

%e ..0..2..2..1..1..0....0..1..2..2..2..0....0..1..1..0..1..0....0..2..1..2..2..0

%e ..1..1..1..1..2..0....0..0..1..2..2..0....0..1..2..2..2..0....1..1..1..1..1..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 25 2013