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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; text; internal format)
OFFSET

6,2

REFERENCES

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

LINKS

Table of n, a(n) for n=6..10.

D. Gordon, La Jolla Repository of Coverings

K. J. Nurmela and Patric R. J. Östergård, New coverings of t-sets with (t+1)-sets, J. Combinat. Designs, 7 (1999), 217-226.

K. J. Nurmela and Patric R. J. Östergård, 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 A229746 A256579

Adjacent sequences:  A011984 A011985 A011986 * A011988 A011989 A011990

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified April 13 06:02 EDT 2021. Contains 342935 sequences. (Running on oeis4.)