The data available here is basically a copy (as of 2010-07-13) of the data available at Gordon Royle's web page (c) 1999 Gordon Royle.
The graph lists are currently only available in 'graph6' format.
These trees were generated by using the program FreeTree (see [1]).
Vertices | No. of trees |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 3 |
6 | 6 |
7 | 11 |
8 | 23 |
9 | 47 |
10 | 106 |
11 | 235 |
12 | 551 |
13 | 1301 |
14 | 3159 |
15 | 7741 |
16 | 19320 |
17 | 48629 |
18 | 123867 |
19 | 317955 |
20 | 823065 |
[1] G. Li and F. Ruskey, The advantages of forward thinking in generating rooted and free trees. pp. 939-940. 10th Annual ACM-SIAM Symposium on Discrete Algorithms (SODA), 1999.