1,4

a(n) <= A250000(n).

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

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

A solution for n=6:

......

.W...W

...B..

..B.B.

Cf. A250000, A279406.

Sequence in context: A191234 A225373 A138219 * A100835 A120541 A190172

Adjacent sequences: A279402 A279403 A279404 * A279406 A279407 A279408

nonn,hard,more

Andrey Zabolotskiy, Dec 11 2016

approved