|
Search: id:A000270
|
|
|
| A000270 |
|
Number of discordant permutations.
(Formerly M3019 N1221)
|
|
+0
1
|
| |
|
|
OFFSET
|
0,4
|
|
|
REFERENCES
|
J. Touchard, Permutations discordant with two given permutations, Scripta Math., 19 (1953), 109-119.
|
|
FORMULA
|
G.f.: G.f.: 1+(1-x)/(1+x)*Sum_{n>=0} n*n!*(x/(1+x)^2)^n. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Jun 29 2007
|
|
CROSSREFS
|
Sequence in context: A137644 A114174 A006347 this_sequence A000271 A074553 A091641
Adjacent sequences: A000267 A000268 A000269 this_sequence A000271 A000272 A000273
|
|
KEYWORD
|
nonn,nice
|
|
AUTHOR
|
njas
|
|
|
Search completed in 0.002 seconds
|
