%I #5 Mar 30 2012 16:45:36
%S 1,1,1,2,2,2,4,6,10
%N Maximal size of binary code of length n correcting 2 unidirectional errors.
%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_.