n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 3 |
7 | 11 |
8 | 38 |
9 | 156 |
10 | 638 |
11 | 2973 |
12 | 13882 |
13 | 67868 |
14 | 338147 |
15 | 1720303 |
16 | 8905996 |
17 | 46774728 |
18 | 248918004 |
19 | 1340083514 |
20 | 7288922610 |
21 | 40019870539 |
22 | 221582395052 |
23 | 1236358849827 |
[0,0,1,1,2,3,11,38,156,638,2973,13882,67868, 338147,1720303,8905996,46774728,248918004, 1340083514,7288922610,40019870539,221582395052, 1236358849827] |