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Search: id:A055459
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| A055459 |
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a(n) = number of permutations of {1,...,n} which are twice but not 3-times reformable. |
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6
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| 2, 1, 11, 14, 81, 242, 1142, 4771, 29009, 127876, 805947, 4868681, 31862753
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