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A019436 Size of smallest directed 1-covering code of length n with banded structure. 2
1, 2, 3, 6, 10, 18, 31, 60, 106, 196, 352 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..11.

D. Applegate, E. M. Rains and N. J. A. Sloane, On asymmetric coverings and covering numbers, J. Comb. Des. 11 (2003), 218-228.

Index entries for sequences related to covering codes

CROSSREFS

Provides upper bound for A066000.

Sequence in context: A082482 A066000 A011957 * A147852 A061279 A018073

Adjacent sequences:  A019433 A019434 A019435 * A019437 A019438 A019439

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane, Dec 07 2001

STATUS

approved

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Last modified April 16 04:49 EDT 2021. Contains 343030 sequences. (Running on oeis4.)