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A143889
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Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric about main diagonal.
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2
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1, 2, 7, 33, 202, 1671, 17279, 234724, 4081665, 92343898, 2711730350, 103991393887, 5218390436191
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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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