A011979 - OEIS

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A011979

Covering numbers C(n,4,3).

2

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

4,2

COMMENTS

257 <= a(19) <= 258 per LJCR (see Gordon link). - Max Alekseyev, Mar 14 2026

REFERENCES

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

LINKS

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

D. Gordon, La Jolla Covering Repository

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: A217948 A059891 A020213 * A058219 A131863 A074870

Adjacent sequences: A011976 A011977 A011978 * A011980 A011981 A011982

KEYWORD

nonn,hard,more

AUTHOR

N. J. A. Sloane

STATUS

approved