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%I #6 Jan 08 2014 23:18:18
%S 1,2,9,12,174,3132,71930
%N Number of different optimal triangle difference sets M(n,3).
%H J. B. Shearer, <a href="http://www.research.ibm.com/people/s/shearer/dtsopt.html">Difference Triangle Sets: Known optimal solutions</a>.
%H J. B. Shearer, <a href="http://www.research.ibm.com/people/s/shearer/dtslb.html">Difference Triangle Sets: Discoverers</a>
%Y A row of array in A234944. Cf. A234943.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Jan 08 2014