|
Search: id:A002862
|
|
|
| A002862 |
|
Number of nonisomorphic connected functions with no fixed points, or proper rings with n edges.
(Formerly M1403 N0547)
|
|
+0
3
|
|
| 0, 1, 2, 5, 11, 31, 77, 214, 576, 1592, 4375, 12183, 33864, 94741, 265461, 746372, 2102692, 5938630, 16803610, 47639902, 135288198, 384812502, 1096141974, 3126648842, 8929715592, 25533447030
(list; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
R. A. Fisher, Contributions to Mathematical Statistics, Wiley, 1950, 41.399.
|
|
CROSSREFS
|
(A002861) minus (A000081).
Sequence in context: A139466 A139467 A124481 this_sequence A139464 A101837 A124483
Adjacent sequences: A002859 A002860 A002861 this_sequence A002863 A002864 A002865
|
|
KEYWORD
|
nonn,nice
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
EXTENSIONS
|
More terms from and better description from Christian Bower (bowerc(AT)usa.net)
|
|
|
Search completed in 0.002 seconds
|
