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OFFSET
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1,2
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COMMENTS
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In A097871, for each k, decide where the first k in row k will be and where the first k in column k will be. Suppose this partial matrix is K. Sequence gives the number of such K's.
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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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Guenter Stertenbrink (Sterten(AT)aol.com), Sep 08 2004
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STATUS
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approved
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