

A060439


Triangle T(n,k), 1 <= k <= n, giving maximal size of ternary code of length n and covering radius k.


4



1, 3, 1, 5, 3, 1, 9, 3, 3, 1, 27, 8, 3, 3, 1
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OFFSET

1,2


COMMENTS

Next term, T(6,1), is in range 7173.  Kamiel P.F. Verstraten, Jun 29 2015


REFERENCES

G. D. Cohen et al., Covering Codes, NorthHolland, 1997, p. 174.


LINKS

Table of n, a(n) for n=1..15.
W. Haas, Binary and ternary codes of covering radius one: some new lower bounds, Discrete Math., 245 (2002), 161178.
Index entries for sequences related to covering codes


EXAMPLE

Triangle starts:
1;
3,1;
5,3,1;
9,3,3,1;
...


CROSSREFS

First column gives A004044. Cf. A060438, A060440.
Sequence in context: A102662 A142048 A117563 * A206283 A135224 A209578
Adjacent sequences: A060436 A060437 A060438 * A060440 A060441 A060442


KEYWORD

nonn,tabl,nice,more


AUTHOR

N. J. A. Sloane, Apr 07 2001


STATUS

approved



