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Search: id:A145223
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| A145223 |
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a(n) is the number of odd permutations (of an n-set) with exactly 2 fixed points. |
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+0
2
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| 0, 0, 6, 0, 90, 420, 3780, 33264, 333900, 3670920, 44054010, 572697840, 8017775766
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