ZarankiewiczDB,

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z(23,30) = 138

Given by the convex optimisation bound with 18 columns of weight 5 and 12 columns of weight 4.

upper bound = 138, submitted on April 24th, 2016 (link)

By deleting 8 rows and 1 column from the finite projective plane of order 5.

lower bound = 138, submitted on April 24th, 2016 (link)

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