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A131180
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Number of ways of placing non-attacking knights on an n X n chessboard symmetric under 180 degree rotation.
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0
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1, 2, 4, 14, 53, 313, 2170, 31896, 387802, 11507269, 290487893, 15905409672, 816544187208, 90196956861272, 9093799327168995, 2023727669041604444
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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
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AUTHOR
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STATUS
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approved
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