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A220940
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Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor
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1
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2, 208, 7551, 291080, 11115933, 424939090, 16241930112, 620799451653, 23728084357764, 906930211627870, 34664497553698238, 1324939111423377826, 50641541794670836181, 1935610258239045700193, 73982484134692519016233
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