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%I #16 Mar 13 2024 02:58:24
%S 0,0,0,2,2,4,4,8,7,12,10,18
%N 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.
%C a(n) <= A250000(n).
%C a(n) is maximal m such that A279406(n,m) >= m.
%H Andy Huchala, <a href="/A279405/a279405_4.py.txt">Python program</a>.
%e A solution for n=6:
%e ......
%e .W...W
%e ...B..
%e ..B.B.
%e ...B..
%e .W...W
%Y Cf. A250000, A279406.
%K nonn,hard,more
%O 1,4
%A _Andrey Zabolotskiy_, Dec 11 2016
%E a(10)-a(12) from _Andy Huchala_, Mar 10 2024
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