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A279405
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Peaceable coexisting armies of queens on torus: the maximum number m such that m white queens and m black queens can coexist on an n X n toroidal chessboard without attacking each other.
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4
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0, 0, 0, 2, 2, 4, 4, 8, 7, 12, 10, 18
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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COMMENTS
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a(n) is maximal m such that A279406(n,m) >= m.
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LINKS
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EXAMPLE
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A solution for n=6:
......
.W...W
...B..
..B.B.
...B..
.W...W
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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