n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 1 |
8 | 1 |
9 | 21 |
10 | 49 |
11 | 87 |
12 | 289 |
13 | 1009 |
14 | 3425 |
15 | 11605 |
16 | 48481 |
17 | 255569 |
18 | 1441107 |
19 | 8859577 |
20 | 59249469 |
21 | 422335799 |
[1,1,1,1,1,1,1,1,21,49,87,289,1009,3425,11605, 48481,255569,1441107,8859577,59249469,422335799] |