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Search: id:A151581
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| A151581 |
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Number of permutations of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order. |
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+0 1
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| 0, 9, 5020, 526240, 26441856, 862140162, 21078701112, 419567641380, 7160621079552
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