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A279405 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. 2
0, 0, 0, 2, 2, 4, 4, 8, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

a(n) <= A250000(n).

a(n) is maximal m such that A279406(n,m) >= m.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

A solution for n=6:

......

.W...W

...B..

..B.B.

...B..

.W...W

CROSSREFS

Cf. A250000, A279406.

Sequence in context: A191234 A225373 A138219 * A100835 A120541 A190172

Adjacent sequences:  A279402 A279403 A279404 * A279406 A279407 A279408

KEYWORD

nonn,hard,more

AUTHOR

Andrey Zabolotskiy, Dec 11 2016

STATUS

approved

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Last modified October 14 17:31 EDT 2019. Contains 328022 sequences. (Running on oeis4.)