|
Search: id:A004206
|
|
|
| A004206 |
|
Number of permutations of length n with spread 2.
(Formerly M2381)
|
|
+0
1
|
|
| 3, 4, 25, 108, 735, 5248, 40824, 362000, 3628185, 39045888, 478988081, 6227101888, 87146087625, 1314459353088, 20922788404479, 355737629952000, 6402373698206889, 121479069952000000
(list; graph; listen)
|
|
|
OFFSET
|
3,1
|
|
|
REFERENCES
|
Graham, R. L.; Lehmer, D. H. On the permanent of Schur's matrix. J. Austral. Math. Soc. Ser. A 21 (1976), no. 4, 487-497.
|
|
LINKS
|
Graham, R. L.; Lehmer, D. H., On the Permanent of Schur's Matrix, Jour. Australian Math. Soc. 21 (series A) (1976), 487-497.
|
|
CROSSREFS
|
Sequence in context: A128778 A009391 A055348 this_sequence A032832 A041021 A041022
Adjacent sequences: A004203 A004204 A004205 this_sequence A004207 A004208 A004209
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas
|
|
EXTENSIONS
|
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 17 2007
|
|
|
Search completed in 0.002 seconds
|
