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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A011978 Covering numbers C(n,6,2). 0 1, 3, 3, 3, 4, 6, 6, 7, 7, 10, 10, 12, 12, 15, 16, 17, 19 (list; graph; refs; listen; history; text; internal format) OFFSET 6,2 REFERENCES CRC Handbook of Combinatorial Designs, 1996, p. 262. LINKS Table of n, a(n) for n=6..22. Dan Gordon, La Jolla Repository of Coverings Index entries for covering numbers CROSSREFS Sequence in context: A151554 A221028 A334940 * A167025 A238505 A259897 Adjacent sequences: A011975 A011976 A011977 * A011979 A011980 A011981 KEYWORD nonn,hard,more AUTHOR N. J. A. Sloane EXTENSIONS a(19)-a(22) added from Dan Gordon's web site by Jinyuan Wang, Sep 21 2023 STATUS approved

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Last modified July 18 15:13 EDT 2024. Contains 374388 sequences. (Running on oeis4.)