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A143871
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Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric under horizontal reflection.
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1
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1, 2, 3, 13, 18, 425, 371, 27872, 25147, 8144945, 4679546, 6097351181, 3118820527, 16876586891126, 6022295415137
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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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