ZarankiewiczDB,

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Matrix for z(14,21)

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

Found by the scaffold algorithm.

(13.301099442 seconds, score = 72, 72647 recursive calls, max depth = 34)

lower bound = 72, submitted by Andrew Kay on April 22nd, 2016 (link, raw)