|
| |
|
|
A003612
|
|
Symmetries in unrooted 3-trees on n+1 vertices.
(Formerly M0371)
|
|
0
| |
|
|
1, 2, 2, 8, 4, 14, 21, 35, 49, 158, 191, 425, 828, 1864, 3659, 8324, 17344, 39601, 87407, 199984, 453361, 1053816, 2426228, 5672389, 13270695, 31277150, 73874375, 175419550, 417535487, 997758788, 2390172398, 5743235470, 13832781125
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
REFERENCES
| Kathleen A. McKeon, The expected number of symmetries in locally-restricted trees I, pp. 849-860 of Y. Alavi et al., eds., Graph Theory, Combinatorics and Applications. Wiley, NY, 2 vols., 1991.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
|
|
|
LINKS
| Index entries for sequences related to trees
|
|
|
CROSSREFS
| Sequence in context: A134812 A144847 A143625 * A103839 A135727 A075101
Adjacent sequences: A003609 A003610 A003611 * A003613 A003614 A003615
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)
|
| |
|
|
