A019436 Size of smallest directed 1-covering code of length n with banded structure.

1, 2, 3, 6, 10, 18, 31, 60, 106, 196, 352

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, arXiv:math/0205303 [math.CO], 2002; 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,more,nice

Author

N. J. A. Sloane, Dec 07 2001

Status

approved