|
Search: id:A003431
|
|
|
| A003431 |
|
Number of connected irreducible posets with n labeled points.
(Formerly M4857)
|
|
+0
5
|
|
| 0, 1, 0, 0, 1, 12, 104, 956, 10037, 126578, 1971005, 38569954, 958347642, 30400603560, 1234260982770, 64187360439352, 4275470549123119
(list; graph; listen)
|
|
|
OFFSET
|
0,6
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Stanley, Richard P.; Enumeration of posets generated by disjoint unions and ordinal sums. Proc. Amer. Math. Soc. 45 (1974), 295-299.
|
|
LINKS
|
Index entries for sequences related to posets
S. R. Finch, Series-parallel networks
|
|
CROSSREFS
|
Cf. A003430, A046906.
Sequence in context: A078397 A099293 A024454 this_sequence A094530 A157024 A051815
Adjacent sequences: A003428 A003429 A003430 this_sequence A003432 A003433 A003434
|
|
KEYWORD
|
nonn,nice,more
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), R. P. Stanley
|
|
EXTENSIONS
|
More terms from R. P. Stanley, Jun 19 2003
2 more terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 17 2008
|
|
|
Search completed in 0.002 seconds
|
