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Search: id:A117541
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| A117541 |
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Number of permutations P of 1..n such that in P and in the inverse of P, every pair of adjacent numbers are relatively prime. |
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2
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| 1, 2, 6, 9, 56, 23, 399, 442, 2220, 2386, 71577, 22001, 1179483, 1156519, 4975079
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