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A011978 Covering numbers C(n,6,2) (next term is <= 15). 0
1, 3, 3, 3, 4, 6, 6, 7, 7, 10, 10, 12, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

REFERENCES

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

LINKS

Table of n, a(n) for n=6..18.

D. Gordon, La Jolla Repository of Coverings

Index entries for covering numbers

CROSSREFS

Sequence in context: A151554 A221028 A334940 * A167025 A238505 A259897

Adjacent sequences:  A011975 A011976 A011977 * A011979 A011980 A011981

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified June 2 12:56 EDT 2020. Contains 334772 sequences. (Running on oeis4.)