n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 2 |
4 | 6 |
5 | 30 |
6 | 180 |
7 | 1260 |
8 | 10080 |
9 | 90720 |
10 | 907200 |
11 | 9797760 |
12 | 114287040 |
13 | 1416703680 |
14 | 18712086480 |
15 | 260499022680 |
16 | 3833521421760 |
17 | 59158317014280 |
18 | 959784091498944 |
[1,0,2,6,30,180,1260,10080,90720,907200,9797760, 114287040,1416703680,18712086480,260499022680, 3833521421760,59158317014280,959784091498944] |