n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 2 |
6 | 8 |
7 | 45 |
8 | 419 |
9 | 4798 |
10 | 62754 |
11 | 872411 |
12 | 12728018 |
13 | 192324654 |
14 | 2991463239 |
15 | 47663036427 |
16 | 775158142233 |
17 | 12831576165782 |
[0,0,0,1,2,8,45,419,4798,62754,872411,12728018, 192324654,2991463239,47663036427,775158142233, 12831576165782] |