C(23,13,3) = 11

Method of Construction: simple construction: added element to c(v-1,k-1,t) covering

Lower Bound: Schonheim

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