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A221425
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Number of n X 2 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without consecutive moves in the same direction.
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1
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1, 9, 42, 217, 1116, 5722, 29383, 150821, 774219, 3974308, 20401353, 104726538, 537593996, 2759637891, 14166083083, 72718928341, 373288968420, 1916208848267, 9836498426064, 50493818235236, 259200537583569, 1330557304472777
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