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A221788
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Number of 3 X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns.
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1
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0, 0, 0, 5, 24, 142, 840, 4919, 28704, 167344, 975408, 5685161, 33135624, 193128658, 1125636408, 6560689883, 38238502992, 222870328180, 1298983466208, 7571030469197, 44127199349112, 257192165625622, 1499025794404776
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