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Search: id:A151587
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| A151587 |
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Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order. |
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+0
1
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| 0, 4, 11565, 2580588, 229630758, 12719963448, 531411968223, 18510889687040
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