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A143893
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Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric under 180 degree rotation.
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2
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1, 2, 3, 19, 62, 785, 3961, 92618, 796423, 31554358, 442143014
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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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