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Search: id:A072949
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| A072949 |
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Number of permutations p of (1,2,3,...,n) such that sum(k=1,n,abs(k-p(k)))=2n. |
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3
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| 0, 0, 0, 4, 24, 148, 744, 3696, 17640, 83420, 390144, 1817652, 8438664, 39117852, 181136304, 838372452, 3879505944
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