n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 5 |
4 | 34 |
5 | 258 |
6 | 2172 |
7 | 20220 |
8 | 207000 |
9 | 2315880 |
10 | 28143360 |
11 | 369411840 |
12 | 5210956800 |
13 | 78636096000 |
14 | 1264324723200 |
15 | 21579740582400 |
16 | 389730550809600 |
17 | 7425628898688000 |
18 | 148865650053120000 |
19 | 3132539179241472000 |
20 | 69036795668865024000 |
21 | 1590266397644660736000 |
[0,0,1,5,34,258,2172,20220,207000,2315880, 28143360,369411840,5210956800,78636096000, 1264324723200,21579740582400,389730550809600, 7425628898688000,148865650053120000, 3132539179241472000,69036795668865024000, 1590266397644660736000] |