login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A053555 Number of distinct parameter sets (v,k,lambda) for Abelian difference sets of order n = k-lambda with 1 <= lambda <= n-1. 0
1, 2, 3, 2, 1, 2, 1, 2, 5, 0, 2, 1, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
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
Sequence in context: A084311 A353486 A026490 * A324645 A124160 A265847
KEYWORD
nonn,nice,hard,more
AUTHOR
N. J. A. Sloane, Jan 17 2000
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 04:59 EDT 2024. Contains 371264 sequences. (Running on oeis4.)