ZarankiewiczDB,

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z(10,21) = 54

111111
11111
11111
11111
11111
11111
11111
111111
111111
111111

Found by the scaffold algorithm.

(0.033987839 seconds, score = 54, 91 recursive calls, max depth = 25)

lower bound = 54, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

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

upper bound = 54, submitted on April 22nd, 2016 (link)

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