9 ≤ C(26,15,3) ≤ 11

Method of Construction: dynamic programming covering

Lower Bound: Schonheim

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