C(57,15,2) = 19

Created by: LJCR

Method of Construction: Multiple of (19,5,2) covering

Lower Bound: Horsley, Theorem 14a, r=4, d=0

  1  2  3  7 10 20 21 22 26 29 39 40 41 45 48
  1  2  6  9 19 20 21 25 28 38 39 40 44 47 57
  1  4 14 15 16 20 23 33 34 35 39 42 52 53 54
  1  5  8 18 19 20 24 27 37 38 39 43 46 56 57
  1 11 12 13 17 20 30 31 32 36 39 49 50 51 55
  2  3  4  8 11 21 22 23 27 30 40 41 42 46 49
  2  5 15 16 17 21 24 34 35 36 40 43 53 54 55
  2 12 13 14 18 21 31 32 33 37 40 50 51 52 56
  3  4  5  9 12 22 23 24 28 31 41 42 43 47 50
  3  6 16 17 18 22 25 35 36 37 41 44 54 55 56
  3 13 14 15 19 22 32 33 34 38 41 51 52 53 57
  4  5  6 10 13 23 24 25 29 32 42 43 44 48 51
  4  7 17 18 19 23 26 36 37 38 42 45 55 56 57
  5  6  7 11 14 24 25 26 30 33 43 44 45 49 52
  6  7  8 12 15 25 26 27 31 34 44 45 46 50 53
  7  8  9 13 16 26 27 28 32 35 45 46 47 51 54
  8  9 10 14 17 27 28 29 33 36 46 47 48 52 55
  9 10 11 15 18 28 29 30 34 37 47 48 49 53 56
 10 11 12 16 19 29 30 31 35 38 48 49 50 54 57