n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 1 |
7 | 0 |
8 | 1 |
9 | 1 |
10 | 3 |
11 | 3 |
12 | 12 |
13 | 19 |
14 | 63 |
15 | 153 |
16 | 499 |
17 | 1473 |
18 | 4974 |
19 | 16296 |
20 | 56102 |
21 | 192899 |
22 | 674678 |
23 | 2381395 |
24 | 8468424 |
[0,0,0,0,0,1,0,1,1,3,3,12,19,63,153,499,1473,4974, 16296,56102,192899,674678,2381395,8468424] |