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%I #7 Jul 08 2025 02:46:35
%S 8,0,27,0,0,0,20347,0
%N Number of (n,3,7) difference families over Z_n.
%D CRC Handbook of Combinatorial Designs, 1996, p. 285.
%K nonn,hard
%O 7,1
%A _N. J. A. Sloane_