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Search: id:A151601
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| A151601 |
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Number of permutations of 4 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, 3348, 20944448, 15679525340, 5314573995408, 1226608986189748
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