A013576 - OEIS

%I #6 Jan 08 2014 22:08:14

%S 11,22,32,41,51,60,71,80,91,100,111,120,131,140,151

%N Minimal scope of an (n,4) difference triangle.

%D CRC Handbook of Combinatorial Designs, 1996, p. 315.

%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>

%K nonn,hard

%O 1,1

%A _N. J. A. Sloane_.