ZarankiewiczDB,

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z(19,19) = 88

By deleting two rows and two columns from the finite projective plane of order 4; extremal by a theorem of Dybizbański, Dzido and Radziszowski. [DDR13, p. 7]

weight = 88, submitted on April 22nd, 2016 (link)

By Damásdi, Héger and Szőnyi's recursive bound with $\alpha = 1$ and $\beta = 5$. [DHS13, p. 17]

upper bound = 88, submitted on April 22nd, 2016 (link)

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