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A053555
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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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0
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1, 2, 3, 2, 1, 2, 1, 2, 5, 0, 2, 1, 1, 0, 1
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OFFSET
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2,2
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COMMENTS
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a(17) is not known.
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REFERENCES
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D. Jungnickel, Difference Sets, Chapter 7 of Jeffrey H. Dinitz and D. R. Stinson, Contemporary Design Theory, Wiley, 1992, see Appendix.
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LINKS
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EXAMPLE
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The 3 parameter sets for order 4 are (v,k,lambda) = (21,5,1), (16,6,2) and (15,7,3).
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CROSSREFS
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KEYWORD
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nonn,nice,hard,more
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AUTHOR
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STATUS
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approved
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