n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 1 |
8 | 9 |
9 | 25 |
10 | 53 |
11 | 97 |
12 | 275 |
13 | 939 |
14 | 2977 |
15 | 11455 |
16 | 54387 |
17 | 273381 |
18 | 1565737 |
19 | 8740687 |
20 | 56416565 |
21 | 398132663 |
[1,1,1,1,1,1,1,9,25,53,97,275,939,2977,11455, 54387,273381,1565737,8740687,56416565,398132663] |