ZarankiewiczDB,

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Matrix for z(9,16)

111
111
111
111
111
111
111
111
111
111
11
11
11
11
11
11

Found by the general algorithm.

(0.138213376 seconds, score = 42, 292 recursive calls, max depth = 41)

lower bound = 42, submitted by Andrew Kay on April 22nd, 2016 (link, raw)