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A143878
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Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric about main diagonal.
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1
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1, 2, 5, 17, 92, 581, 4989, 54250, 776877, 14503255, 356467268, 11553201879, 495106836021
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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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