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A072948
Number of permutations p of (1,2,3,...,2n) such that sum(k=1,2n,abs(k-p(k)))=2n.
+0
2
1, 7, 46, 327, 2350, 17222, 127508, 952299
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Maintained by
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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.
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