ZarankiewiczDB,

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z(13,19) = 64

1111
1111
1111
111
111
111
1111
111
111
111
1111
111
111
111
111
111
111
1111
1111

Found by the scaffold algorithm.

(0.093403491 seconds, score = 64, 509 recursive calls, max depth = 20)

lower bound = 64, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

By Roman's bound with $p = 3$. [Rom75]

upper bound = 64, submitted on April 22nd, 2016 (link)

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