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Number of distinct parameter sets (v,k,lambda) for Abelian difference sets of order n = k-lambda with 1 <= lambda <= n-1.
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%I #13 Feb 03 2020 10:27:40

%S 1,2,3,2,1,2,1,2,5,0,2,1,1,0,1

%N Number of distinct parameter sets (v,k,lambda) for Abelian difference sets of order n = k-lambda with 1 <= lambda <= n-1.

%C a(17) is not known.

%D D. Jungnickel, Difference Sets, Chapter 7 of Jeffrey H. Dinitz and D. R. Stinson, Contemporary Design Theory, Wiley, 1992, see Appendix.

%e The 3 parameter sets for order 4 are (v,k,lambda) = (21,5,1), (16,6,2) and (15,7,3).

%K nonn,nice,hard,more

%O 2,2

%A _N. J. A. Sloane_, Jan 17 2000