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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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0
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1, 3, 27, 171, 3267, 44235, 1827981, 53678097, 4829415021, 309226567689, 60771492609849, 8507664353592081, 3659154831341169651, 1121748956533219703391
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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