n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 20 |
3 | 168 |
4 | 1968 |
5 | 29280 |
6 | 525600 |
7 | 11027520 |
8 | 264579840 |
9 | 7142929920 |
10 | 214280640000 |
11 | 7071181286400 |
12 | 254561568307200 |
13 | 9927888709939200 |
14 | 416971151460864000 |
15 | 18763699200390144000 |
16 | 900657519773147136000 |
[2,4,20,168,1968,29280,525600,11027520,264579840, 7142929920,214280640000,7071181286400, 254561568307200,9927888709939200, 416971151460864000,18763699200390144000, 900657519773147136000] |