n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 2 |
6 | 7 |
7 | 34 |
8 | 257 |
9 | 2606 |
10 | 32300 |
11 | 440564 |
12 | 6384634 |
13 | 96262938 |
14 | 1496225352 |
15 | 23833988129 |
16 | 387591510244 |
17 | 6415851530241 |
18 | 107854282197058 |
[0,0,0,1,2,7,34,257,2606,32300,440564,6384634, 96262938,1496225352,23833988129,387591510244, 6415851530241,107854282197058] |