14 ≤ C(20,13,4) ≤ 15

Created by: Alessandro Jurcovich

Method of Construction: ex 16

Lower Bound: Schonheim

  1  2  3  4  5  6 10 15 16 17 18 19 20
  1  2  3  4  7  8  9 11 12 13 14 16 18
  1  2  3  5  6  7  8 10 12 15 17 19 20
  1  2  3  5  6  9 11 12 13 14 15 17 20
  1  2  3  5  9 10 11 12 13 14 15 19 20
  1  4  5  6  8 10 12 15 16 17 18 19 20
  1  4  5  7  9 11 13 14 15 16 17 18 20
  1  4  6  7  9 10 11 13 14 16 18 19 20
  1  5  6  8  9 10 11 13 14 15 17 19 20
  2  3  4  5  7  8  9 12 14 15 16 18 20
  2  3  4  5  7  8 11 12 13 15 16 18 20
  2  3  4  6  7  8 10 12 13 16 17 18 19
  2  3  4  6  8  9 10 11 12 14 17 18 19
  2  3  6  7  8  9 10 11 12 14 16 17 19
  4  5  6  7  9 10 11 13 14 15 16 18 19