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Search: id:A141442
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| A141442 |
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Number of n X n integer matrices, symmetric about both diagonal and antidiagonal, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once. |
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| 1, 3, 27, 171, 3267, 44235, 1827981, 53678097, 4829415021, 309226567689, 60771492609849, 8507664353592081, 3659154831341169651, 1121748956533219703391
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