A011981 Covering numbers C(n,6,3).

1, 4, 4, 7, 10, 11, 15

Offset

6,2

Comments

a(13) <= 21.

References

CRC Handbook of Combinatorial Designs, 1996, p. 262.

Links

Table of n, a(n) for n=6..12.

D. Gordon, La Jolla Repository of Coverings.

Wikipedia, Covering design.

Index entries for covering numbers.

Crossrefs

Sequence in context: A371556 A214990 A185670 * A238131 A212532 A109544

Adjacent sequences: A011978 A011979 A011980 * A011982 A011983 A011984

Keyword

nonn,hard,more

Author

N. J. A. Sloane

Status

approved