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A141441
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Number of symmetric n X n integer matrices with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
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1
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1, 9, 171, 6939, 609309, 116330103, 48439766655, 44076693953673, 87758086456790325, 382686760306598834367, 3657439086014690607695427, 76650406140131002235613079269, 3523958963105797496154269304608661
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