|
Search: id:A053555
|
|
|
| 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
|
|
| 1, 2, 3, 2, 1, 2, 1, 2, 5, 0, 2, 1, 1, 0, 1
(list; graph; listen)
|
|
|
OFFSET
|
2,2
|
|
|
REFERENCES
|
D. Jungnickel, Difference Sets, Chapter 7 of J. H. Dinitz and D R. Stinson, Contemporary Design Theory, Wiley, 1992, see Appendix.
|
|
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: A137927 A084311 A026490 this_sequence A124160 A002175 A068073
Adjacent sequences: A053552 A053553 A053554 this_sequence A053556 A053557 A053558
|
|
KEYWORD
|
nonn,nice,hard
|
|
AUTHOR
|
njas, Jan 17 2000
|
|
EXTENSIONS
|
a(16) is not known.
|
|
|
Search completed in 0.002 seconds
|
