14 ≤ C(21,15,5) ≤ 16

Method of Construction: dynamic programming covering

Lower Bound: Schonheim

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