|
Search: id:A066586
|
|
|
| A066586 |
|
Number of normal subgroups of the group of n X n signed permutations matrices (described in sequence A066051). |
|
+0
1
|
|
| 2, 6, 9, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
The similar sequence for the "ordinary" symmetric group S_n is 1, 2, 3, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, ...
|
|
FORMULA
|
For n>=5 a(n) = 9.
|
|
CROSSREFS
|
Cf. A066051.
Sequence in context: A015843 A109600 A071814 this_sequence A133160 A128906 A139639
Adjacent sequences: A066583 A066584 A066585 this_sequence A066587 A066588 A066589
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Sharon Sela (sharonsela(AT)hotmail.com), Jan 07 2002
|
|
|
Search completed in 0.002 seconds
|
