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A267164
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Number of 3 X n arrays containing n copies of 0..3-1 with no element 1 greater than its west, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
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2
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2, 0, 1, 15, 65, 202, 537, 1559, 6506, 27557, 104122, 360598, 1236670, 4479897, 16998081, 64623235, 240399786, 880495525, 3233751496, 12035510317, 45240963675, 170207777737, 637838570111, 2384646622991, 8931032553574
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