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A269506
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Number of 2Xn arrays containing n copies of 0..2-1 avoiding the pattern down-up in every row and column.
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2
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2, 6, 14, 34, 92, 258, 722, 2022, 5706, 16232, 46442, 133418, 384550, 1111614, 3221582, 9357450, 27233148, 79394646, 231822854, 677835636, 1984435484, 5816254262, 17064740572, 50114985298, 147303657830, 433319078074
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