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%I #6 Mar 30 2012 16:52:01
%S 1,4,12,44,160,640,2240,8912,32256
%N Size of optimal DNA code of length n and minimal distance 1 over alphabet of size 4.
%C See Sun et al. reference for precise definition.
%D J. Sun, S. Houghten and J. Ross, Edit metric codes with combinatorial DNA constraints, Congessus Numerant., 204 (2010), 65-92 (see Table 1).
%F One bisection appears to be A098400.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Apr 05 2011
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