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A268536
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The number of permutations of {1,2,...,n,1,2,...,n} with the property that there are k numbers between the two k's in the set for k=1,...,n, as n runs through the positive integers congruent to -1 or 0 mod 4.
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1
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2, 2, 52, 300, 35584, 216288, 79619280, 653443600, 513629782560, 5272675722400, 7598911885030976, 93690316113031872, 223367222197529806464, 3214766521218764786304
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OFFSET
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1,1
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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