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A180394
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Number of permutations of 1..n with both permutation and its inverse having exactly 4 maxima
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0
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0, 0, 0, 0, 0, 0, 19, 1784, 55092, 952640, 11346508, 103655440, 774656344, 4940080352, 27682462431
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OFFSET
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1,7
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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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