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A222668
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Number of nX3 0..2 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order
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1
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0, 2, 2, 40, 90, 1336, 3458, 44516, 126476, 1527344, 4599422, 53131172, 167316392, 1872027432, 6086187592, 66611566008, 221500197840, 2388653206624, 8068017360224, 86178588357352, 294198667299936, 3124170165050528
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