20 ≤ C(20,9,3) ≤ 21

Created by: Felix Rodriguez Martin

Lower Bound: Schonheim

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