00000111122223333 01111122223333000 02222133320003111 03333100021113222 10123212332300301 11032221033210032 12301230130120123 13210203231030210 20231313002011312 21320320303101021 22013331200231130 23102302101321203 30312010212132320 31203023113022013 32130032010312102 33021001311202231 0123+012301230123 The + is the point that is not colored. I got this grid by trying to add a row to a 4-coloring of a 16x17 grid.