A053555 - OEIS

A053555

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

1, 2, 3, 2, 1, 2, 1, 2, 5, 0, 2, 1, 1, 0, 1

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OFFSET

2,2

COMMENTS

a(17) is not known.

REFERENCES

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

LINKS

EXAMPLE

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

CROSSREFS

KEYWORD

nonn,nice,hard,more

AUTHOR

STATUS

approved