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A221815
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Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns
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1
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1, 91, 1041, 29412, 574706, 13076919, 280280821, 6157362467, 133971367251, 2926556131807, 63829507756107, 1393042238694910, 30394642476262010, 663246016374693512, 14472196608372584944, 315792262364985554100
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