ZarankiewiczDB,

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z(13,26) = 78

111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
111111

Found by the scaffold algorithm.

(58.548586482 seconds, score = 78, 400101 recursive calls, max depth = 40)

lower bound = 78, submitted by Andrew Kay on April 23rd, 2016 (link, raw)

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

upper bound = 78, submitted on April 22nd, 2016 (link)

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