|
| |
|
|
A122681
|
|
Total Wiener index of (free?) trees on n nodes (see Wagner for precise definition).
|
|
2
| |
|
|
0, 1, 4, 19, 54, 180, 508, 1533, 4332, 13041, 37492, 111367, 326636, 968802, 2858460, 8483290, 25113618, 74512947, 220885446, 655274837, 1943117294, 5763235194, 17089323366, 50673594159, 150232437482, 445359235627, 1320070201468
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,3
|
|
|
COMMENTS
| C program, see the first Bomfim link, around the function Gen() of Gang Li & Frank Ruskey. - W. Bomfim, Feb 23 2011
|
|
|
LINKS
| W. Bomfim, C program
Stephan Wagner, Graph-theoretical enumeration and digital expansions: an analytic approach, Dissertation, Fakult. f. Tech. Math. u. Tech. Physik, Tech. Univ. Graz, Austria, Feb. 2006, page 31
Stephan Wagner, On the average Wiener index of degree-restricted trees, Australas. J. Combinat. 37 (2007) 187, Table 2
|
|
|
CROSSREFS
| Cf. A000055.
Sequence in context: A166808 A186310 A122684 * A174612 A020496 A108484
Adjacent sequences: A122678 A122679 A122680 * A122682 A122683 A122684
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Sep 23 2006
|
|
|
EXTENSIONS
| a(11)-a(27) from W. Bomfim, Feb 23 2011
|
| |
|
|
