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A141444
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Number of n X n integer matrices, symmetric under 90 degree rotation, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
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0
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1, 1, 9, 17, 309, 1265, 48927, 435807, 36527739, 709448287, 129684847323, 5504589599263, 2200548059561679, 204460755826652731
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