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A143873
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Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about both diagonal and antidiagonal.
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1
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1, 2, 3, 5, 8, 21, 53, 158, 503, 2181, 9658, 53517, 313683, 2389270
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OFFSET
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0,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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