ZarankiewiczDB,

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z(20,24) = 105

1111111
11111
111111
111111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
111111

Found by manually adding a column of weight 2 to Matrix 193.

lower bound = 105, submitted by Andrew Kay on April 23rd, 2016 (link, raw)

Related: Bound 2082

By the density principle on z(19,24).

upper bound = 105, submitted on April 23rd, 2016 (link)

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