ZarankiewiczDB,

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z(16,18) = 73

By deleting 5 rows and 3 columns from the finite projective plane of order 4.

lower bound = 73, 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 = 73, submitted on April 22nd, 2016 (link)

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