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A221604
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Number of n X 3 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns.
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1
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2, 10, 54, 287, 1522, 8072, 42810, 227042, 1204112, 6385980, 33867896, 179617596, 952597728, 5052079816, 26793587384, 142099165304, 753619606464, 3996803992704, 21196956686208, 112417565028752, 596203932200160
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