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A221605
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Number of n X 4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns.
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0
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4, 53, 811, 12270, 184193, 2764070, 41480899, 622510123, 9342086217, 140197824897, 2103965848896, 31574471975014, 473841949757344, 7111003899609738, 106715702327136893, 1601495553082204043
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