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%I #7 Mar 30 2012 16:45:33
%S 1,1,1,2,2,2,2,4,4,6,8,12,18
%N Maximal size of binary code of length n and asymmetric distance 4.
%D T. Etzion, New lower bounds for asymmetric and unidirectional codes, IEEE Trans. Inform. Theory, 37 (1991), 1696-1705.
%D J. H. Weber, Bounds and Constructions for Binary Block Codes Correcting Asymmetric or Unidirectional Errors, Ph. D. Thesis, Tech. Univ. Delft, 1989.
%D 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.
%K nonn
%O 1,4
%A _N. J. A. Sloane_.
%E There is a typo at the n=6 term in the printed version of the paper.
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