%I A011986
%S A011986 1,5,5,9,12
%N A011986 Covering numbers C(n,7,4) (next term is <= 19).
%D A011986 CRC Handbook of Combinatorial Designs, 1996, p. 263.
%H A011986 D. Gordon, <a href="http://www.ccrwest.org/cover.html">La Jolla Repository 
               of Coverings</a>
%H A011986 <a href="Sindx_Cor.html#covnum">Index entries for covering numbers</a>
%Y A011986 Sequence in context: A021951 A124175 A163980 this_sequence A047880 A058491 
               A058584
%Y A011986 Adjacent sequences: A011983 A011984 A011985 this_sequence A011987 A011988 
               A011989
%K A011986 nonn,hard
%O A011986 8,2
%A A011986 N. J. A. Sloane (njas(AT)research.att.com).