|
Search: id:A006860
|
|
|
| A006860 |
|
Tiered orders on n nodes.
(Formerly M2959)
|
|
+0
2
|
|
| 1, 3, 13, 111, 1381, 25623, 678133, 26269735, 1447451707, 114973020921, 13034306495563
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
G. Kreweras, Denombrement des ordres etages, Discrete Math., 53 (1985), 147-149.
|
|
CROSSREFS
|
Sequence in context: A098027 A073587 A061377 this_sequence A090537 A063269 A098406
Adjacent sequences: A006857 A006858 A006859 this_sequence A006861 A006862 A006863
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Simon Plouffe (simon.plouffe(AT)gmail.com)
|
|
|
Search completed in 0.002 seconds
|
