ZarankiewiczDB,

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Matrix for z(13,26)

111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
111111

Found by the scaffold algorithm.

(58.548586482 seconds, score = 78, 400101 recursive calls, max depth = 40)

lower bound = 78, submitted by Andrew Kay on April 23rd, 2016 (link, raw)