ZarankiewiczDB,

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z(26,30) = 155

Given by the convex optimisation bound with 25 columns of weight 5 and 5 columns of weight 6.

upper bound = 155, submitted on April 23rd, 2016 (link)

By deleting five rows and one column from the finite projective plane of order 5.

lower bound = 155, submitted on April 23rd, 2016 (link)

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