A011990 Covering numbers C(n,9,5).

1, 6, 7, 12

Offset

9,2

Comments

a(13) <= 19.

References

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

Links

Table of n, a(n) for n=9..12.

D. Gordon, La Jolla Repository of Coverings.

Wikipedia, Covering design.

Index entries for covering numbers.

Crossrefs

Sequence in context: A228948 A297128 A035110 * A105085 A287412 A097354

Adjacent sequences: A011987 A011988 A011989 * A011991 A011992 A011993

Keyword

nonn,hard,more

Author

N. J. A. Sloane

Status

approved