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A180237
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Number of lexicographically ordered pairs of permutations of 0..2n-2 such that their sum mod 2n-1 is also a permutation of 0..2n-2
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0
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OFFSET
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1,2
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COMMENTS
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Numbers for permutations of 0..2n-1 are zero.
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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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