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A051571
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Consider problem of placing N queens on an n X n board so that each queen attacks precisely k others. Here k=4 and sequence gives number of different solutions when N takes its maximal value.
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12
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OFFSET
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3,5
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REFERENCES
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M. Gardner, The Last Recreations, Springer, 1997, p. 282.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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Probably an incorrect version of A019654.
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STATUS
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approved
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