n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 2 |
7 | 7 |
8 | 31 |
9 | 168 |
10 | 1025 |
11 | 7013 |
12 | 52495 |
13 | 425213 |
14 | 3696032 |
15 | 34291937 |
16 | 338161526 |
17 | 3532185118 |
18 | 38963334652 |
19 | 452704892533 |
20 | 5526901638291 |
21 | 70746674291507 |
[0,0,0,0,1,2,7,31,168,1025,7013,52495,425213, 3696032,34291937,338161526,3532185118,38963334652, 452704892533,5526901638291,70746674291507] |