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A180393
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Number of permutations of 1..n with both permutation and its inverse having exactly 3 maxima
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0
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0, 0, 0, 0, 3, 118, 1719, 15080, 96080, 489240, 2106564, 7954480, 27009063, 83965806, 242238695
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OFFSET
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1,5
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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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