13 ≤ C(21,11,3) ≤ 14

Created by: LJCR

Method of Construction: Simple construction: induced from (22,12,4)

Lower Bound: Horsley-Singh, Theorem 6, s=1

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