%I #13 Dec 30 2019 15:05:19

%S 5,7,12,20,32

%N Covering numbers C(n,6,4) (next term is <= 41).

%D CRC Handbook of Combinatorial Designs, 1996, p. 263.

%H D. Gordon, <a href="http://www.dmgordon.org/cover">La Jolla Repository of Coverings</a>

%H <a href="/index/Cor#covnum">Index entries for covering numbers</a>

%K nonn,more,hard

%O 6,1

%A _N. J. A. Sloane_.