n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 9 |
7 | 21 |
8 | 73 |
9 | 310 |
10 | 1107 |
11 | 5232 |
12 | 33319 |
13 | 240772 |
14 | 2106289 |
15 | 21011261 |
16 | 262231181 |
17 | 3633528079 |
18 | 62517538899 |
[1,1,1,1,1,9,21,73,310,1107,5232,33319,240772, 2106289,21011261,262231181,3633528079,62517538899] |