13 ≤ C(31,20,4) ≤ 16

Created by: Kamal Fadlaoui

Method of Construction: Tabu Search

Lower Bound: Schonheim

  1  2  3  4  5  6  7  8  9 10 11 12 14 16 17 23 27 28 29 30
  1  2  3  4  5  7  8  9 10 11 13 14 16 19 20 23 25 29 30 31
  1  2  3  4  6  8  9 10 13 14 15 17 18 21 22 23 24 26 27 29
  1  2  3  4  6  9 10 12 13 16 17 19 20 22 25 27 28 29 30 31
  1  2  3  5  6  7  8 10 11 12 13 14 17 19 20 23 25 27 28 31
  1  2  3  5  6  7 10 11 13 15 16 17 18 21 22 23 24 26 29 30
  1  2  9 10 12 13 15 16 17 18 19 20 21 24 25 26 27 28 30 31
  1  3  7  8 12 14 15 17 18 19 20 21 22 23 24 25 26 28 29 31
  1  4  5  6  7  9 11 13 15 17 18 19 20 21 22 24 26 27 29 31
  1  4  5  6  8 11 12 13 14 15 16 17 18 21 22 24 25 26 28 30
  2  3  4  5  6 10 11 12 15 18 19 20 21 22 23 24 25 26 28 31
  2  4  6  7  8 10 14 15 16 18 19 20 21 22 23 24 26 29 30 31
  2  5  7  8  9 10 11 12 13 14 15 18 21 22 24 25 26 27 28 29
  3  4  6  7  9 12 13 15 16 18 21 22 23 24 25 26 27 28 29 30
  3  5  8  9 11 13 14 15 16 18 19 20 21 22 23 24 26 27 30 31
  4  5  6  7  8  9 11 12 14 16 17 19 20 23 25 27 28 29 30 31