|
Search: id:A001121
|
|
|
| A001121 |
|
Number of doubly-regular tournaments of order 4n-1. |
|
+0
1
|
| |
|
|
OFFSET
|
2,3
|
|
|
COMMENT
|
Equally, number of skew digraphs in switching classes of Hadamard matrices of order 4n.
|
|
REFERENCES
|
Spence, Edward; Classification of Hadamard matrices of order 24 and 28. Discrete Math. 140 (1995), no. 1-3, 185-243.
|
|
CROSSREFS
|
Sequence in context: A131657 A059523 A038623 this_sequence A116567 A087541 A015167
Adjacent sequences: A001118 A001119 A001120 this_sequence A001122 A001123 A001124
|
|
KEYWORD
|
nonn,hard,nice
|
|
AUTHOR
|
njas
|
|
EXTENSIONS
|
Better name suggested by Brendan McKay, Oct 31 2007
|
|
|
Search completed in 0.002 seconds
|
