ZarankiewiczDB,

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Matrix for z(12,18)

111
111
1111
1111
111
111
111
111
111
111
111
111
111
111
111
111
111
1111

Found by the scaffold algorithm.

(0.900821473 seconds, score = 57, 5985 recursive calls, max depth = 19)

lower bound = 57, submitted by Andrew Kay on April 22nd, 2016 (link, raw)