ZarankiewiczDB,

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Matrix for z(13,24)

111111
111111
111111
11111
111111
11111
11111
11111
11111
11111
111111
111111
1111111

Found by the scaffold algorithm.

(0.702099848 seconds, score = 73, 4228 recursive calls, max depth = 36)

lower bound = 73, submitted by Andrew Kay on April 23rd, 2016 (link, raw)