C(20,15,6) = 19

Method of Construction: dynamic programming covering

Lower Bound: Schonheim

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