ZarankiewiczDB,

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Matrix for χ(18,18)

211334443132142123
121433344213214312
112343434321421231
443211334132231214
344121433213123421
434112343321312142
334443211241132213
433344121124213321
343434112412321132
124124213122434334
412412321212443433
241241132221344343
123214124343122443
312421412334212344
231142241433221434
142231241344433122
214123124434343212
421312412443334221

C.f. Matrix 300. Given by Dybizbański, Dzido and Radziszowski. [DDR13, p. 11]

colors = 4, submitted on April 22nd, 2016 (link, raw)