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A229438
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Number of n X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing
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0
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3, 7, 22, 109, 753, 6374, 62205, 676983, 8026548, 101907085, 1368004992, 19233435438, 281169127711, 4249797119751, 66116288446463
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