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A143876
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Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under horizontal reflection.
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1
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1, 2, 3, 27, 26, 1119, 921, 122658, 74887, 43743593, 18775998, 43803694319, 14699916393, 143879089856822, 34113001129873
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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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