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%I #12 Sep 21 2023 16:57:32
%S 1,3,3,3,4,6,6,7,7,10,10,12,12,15,16,17,19
%N Covering numbers C(n,6,2).
%D CRC Handbook of Combinatorial Designs, 1996, p. 262.
%H Dan Gordon, <a href="https://www.dmgordon.org/cover">La Jolla Repository of Coverings</a>
%H <a href="/index/Cor#covnum">Index entries for covering numbers</a>
%K nonn,hard,more
%O 6,2
%A _N. J. A. Sloane_
%E a(19)-a(22) added from Dan Gordon's web site by _Jinyuan Wang_, Sep 21 2023
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