ZarankiewiczDB,

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z(18,19) = 84

By deleting 3 rows and 2 columns from the finite projective plane of order 4.

lower bound = 84, 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 = 84, submitted on April 22nd, 2016 (link)

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