ZarankiewiczDB,

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z(25,30) = 150

Given by the convex optimisation bound with 30 columns of weight 5.

upper bound = 150, submitted on April 23rd, 2016 (link)

By deleting 6 rows and 1 column from the finite projective plane of order 5.

lower bound = 150, submitted on April 23rd, 2016 (link)

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