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Search: id:A151585
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| A151585 |
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Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order. |
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1
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| 0, 3, 976, 44275, 1046556, 18098871, 262962368, 3438697635, 42050013500
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