ZarankiewiczDB,

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Matrix for z(15,21)

11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
1111111

Found by the scaffold algorithm.

(4.097522171 seconds, score = 77, 21602 recursive calls, max depth = 36)

lower bound = 77, submitted by Andrew Kay on April 22nd, 2016 (link, raw)