1,4

T. Etzion, New lower bounds for asymmetric and unidirectional codes, IEEE Trans. Inform. Theory, 37 (1991), 1696-1705.

J. H. Weber, Bounds and Constructions for Binary Block Codes Correcting Asymmetric or Unidirectional Errors, Ph. D. Thesis, Tech. Univ. Delft, 1989.

J. H. Weber, C. de Vroedt and D. E. Boekee, Bounds and constructions for binary codes of length less than 24 and asymmetric distance less than 6, IEEE Trans. Inform. Theory, 34 (1988), 1321-1332.

Sequence in context: A032576 A071809 A104976 this_sequence A010578 A005866 A125584

Adjacent sequences: A010331 A010332 A010333 this_sequence A010335 A010336 A010337

nonn

N. J. A. Sloane (njas(AT)research.att.com).

There is a typo at the n=6 term in the printed version of the paper.