n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 18 |
4 | 168 |
5 | 1800 |
6 | 22320 |
7 | 317520 |
8 | 5120640 |
9 | 92534400 |
10 | 1854316800 |
11 | 40834886400 |
12 | 980516275200 |
13 | 25499650176000 |
14 | 714077383219200 |
15 | 21423629170944000 |
16 | 685577056260096000 |
17 | 23309975600271360000 |
[0,0,2,18,168,1800,22320,317520,5120640,92534400, 1854316800,40834886400,980516275200, 25499650176000,714077383219200,21423629170944000, 685577056260096000,23309975600271360000] |