%I #4 Mar 30 2012 16:45:41
%S 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,10,0,0,0,0,0,0,
%T 0,0,224,0,0,206,0,0,0,0,0,0,0,0,18132,0,0,12048
%N (n,4,1) difference families over Z_n.
%D CRC Handbook of Combinatorial Designs, 1996, p. 286.
%K nonn,hard
%O 13,25
%A _N. J. A. Sloane_.