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A011987 Covering numbers C(n,6,5) (next term is <= 100). 2
1, 6, 12, 30, 50 (list; graph; refs; listen; history; internal format)
OFFSET

6,2

REFERENCES

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

LINKS

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

CROSSREFS

A column of A066010.

Sequence in context: A161348 A071342 A125056 * A036690 A014131 A122211

Adjacent sequences:  A011984 A011985 A011986 * A011988 A011989 A011990

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 14 16:40 EST 2012. Contains 205635 sequences.