%I #9 Mar 12 2019 11:47:06
%S 1,1,1,3,3,3,4,6,7,8,9,11,12,14,15,17,18
%N Maximal size of (n,4,2) optical orthogonal code.
%C Conjectured to agree with A091848 except for n = 9 and 13.
%H W. Chu and C. J. Colbourn, <a href="https://doi.org/10.1016/S0012-365X(03)00266-8">Optimal (n,4,2)-OCC of small orders</a>, Discrete Math., 279 (2004), 163-172.
%Y Cf. A091848.
%K nonn,more
%O 7,4
%A _N. J. A. Sloane_, Mar 13 2004
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