n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 0 |
8 | 0 |
9 | 1 |
10 | 6 |
11 | 9 |
12 | 24 |
13 | 58 |
14 | 124 |
15 | 312 |
16 | 759 |
17 | 1768 |
18 | 4421 |
19 | 10811 |
20 | 27191 |
21 | 68591 |
22 | 174627 |
23 | 441633 |
24 | 1124795 |
25 | 2866004 |
[0,0,0,0,0,0,0,0,1,6,9,24,58,124,312,759,1768, 4421,10811,27191,68591,174627,441633,1124795, 2866004] |