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Search: id:A011979
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| A011979 |
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Covering numbers C(n,4,3) (next term is <= 261). |
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+0
3
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| 1, 4, 6, 12, 14, 25, 30, 47, 57, 78, 91, 124, 140, 183, 207
(list; graph; listen)
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OFFSET
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4,2
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REFERENCES
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CRC Handbook of Combinatorial Designs, 1996, p. 262.
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LINKS
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D. Gordon, La Jolla Repository of Coverings
K. J. Nurmela and P. R. J. Ostergard, New coverings of t-sets with (t+1)-sets, J. Combinat. Designs, 7 (1999), 217-226.
K. J. Nurmela and P. R. J. Ostergard, New coverings of t-sets with (t+1)-sets (appendix), J. Combinat. Designs, 7 (1999), 217-226.
Index entries for covering numbers
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CROSSREFS
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A column of A066010.
Sequence in context: A136415 A059891 A020213 this_sequence A058219 A131863 A074870
Adjacent sequences: A011976 A011977 A011978 this_sequence A011980 A011981 A011982
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KEYWORD
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nonn,hard
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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