ZarankiewiczDB,

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z(13,25) = 75

111111
111111
111111
111111
111111
11111
111111
11111
111111
11111
111111
111111
111111

Found by the scaffold algorithm.

(30.338298862 seconds, score = 75, 198111 recursive calls, max depth = 37)

lower bound = 75, submitted by Andrew Kay on April 23rd, 2016 (link, raw)

By the density principle on z(12,25).

upper bound = 75, submitted on April 22nd, 2016 (link)

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