19 ≤ C(15,9,4) ≤ 20

Created by: Felix Rodriguez Martin

Lower Bound: Schonheim

  1  2  3  4  6  8  9 11 12
  1  2  3  4  6  9 10 14 15
  1  2  3  5  6  7  9 10 12
  1  2  3  8 10 12 13 14 15
  1  2  4  5  8  9 10 14 15
  1  2  4  7  9 12 13 14 15
  1  2  5  6 11 12 13 14 15
  1  2  6  7  8 10 11 14 15
  1  3  4  5  6  7  9 11 15
  1  3  4  6  9 10 11 13 14
  1  3  5  6  7  8  9 13 14
  1  4  5  7  8 10 11 12 13
  2  3  4  5  8 11 13 14 15
  2  3  4  6  7  8  9 10 13
  2  3  4  7 10 11 12 14 15
  2  4  5  6  7  8 12 14 15
  2  5  7  9 10 11 13 14 15
  3  4  5  6  9 10 12 13 15
  3  5  6  8  9 10 11 12 14
  3  6  7  8  9 11 12 13 15