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A143872
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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 main diagonal.
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1
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1, 2, 5, 15, 62, 329, 2307, 21482, 264021, 4334045, 94435970, 2750500857, 106769182533
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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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