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A267162
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Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west, southwest or northwest neighbor modulo n and the upper left element equal to 0.
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0
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1, 0, 0, 8, 411, 30362, 2742512, 317221226, 46165940578, 8303305172988, 1813340078934264
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