ZarankiewiczDB,

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z(9,20) = 48

11111
11111
11111
11111
11111
11111
111111
111111
111111

Found by the scaffold algorithm.

(0.040696234 seconds, score = 48, 148 recursive calls, max depth = 22)

lower bound = 48, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

By Roman's bound with $p = 2$. [Rom75]

upper bound = 48, submitted on April 22nd, 2016 (link)

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