A011987 Covering numbers C(n,6,5).

1, 6, 12, 30, 50

Offset

6,2

Comments

a(11) <= 100.

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.

Wikipedia, Covering design.

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,more

Author

N. J. A. Sloane

Status

approved