A011979 Covering numbers C(n,4,3) (next term is <= 261).

1, 4, 6, 12, 14, 25, 30, 47, 57, 78, 91, 124, 140, 183, 207

Offset

4,2

References

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

Links

Table of n, a(n) for n=4..18.

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: A217948 A059891 A020213 * A058219 A131863 A074870

Adjacent sequences: A011976 A011977 A011978 * A011980 A011981 A011982

Keyword

nonn,hard

Author

N. J. A. Sloane

Status

approved