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A049526
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Number of possible sets {{row sums}, {column sums}} of a 2n X 2n matrix with entries from {0,1,-1} and all row and column sums distinct.
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2
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OFFSET
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1,1
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COMMENTS
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It is known that such matrices of size (2n+1) X (2n+1) do not exist.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,nice,hard,more
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AUTHOR
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STATUS
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approved
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