A221767 - OEIS

%I #3 Jan 25 2013 05:06:52

%S 0,55,3125,141177,7115200,347487163,16949434757,827634377153,

%T 40390407683703,1971106075073481,96192307643812016,

%U 4694244462294115117,229081654358812855517,11179298440465068878911

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

%C Column 6 of A221768

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 25 2013