n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 3 |
4 | 9 |
5 | 58 |
6 | 160 |
7 | 440 |
8 | 1166 |
9 | 3202 |
10 | 8656 |
11 | 23475 |
12 | 64194 |
13 | 174557 |
14 | 473592 |
15 | 1286383 |
16 | 3495241 |
17 | 9501807 |
18 | 25833916 |
[0,0,3,9,58,160,440,1166,3202,8656,23475,64194, 174557,473592,1286383,3495241,9501807,25833916] |