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A264558
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Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 3.
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0
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1, 3, 15, 156, 2032, 30912, 737280, 19491840, 585019584, 26539425792, 1275815411712, 65050879721472
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