n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 4 |
3 | 12 |
4 | 48 |
5 | 240 |
6 | 1440 |
7 | 10080 |
8 | 80640 |
9 | 725760 |
10 | 7257600 |
11 | 79833600 |
12 | 958003200 |
13 | 12454041600 |
14 | 174356582400 |
15 | 2615348736000 |
16 | 41845579776000 |
17 | 711374856192000 |
18 | 12804747411456000 |
19 | 243290200817664000 |
20 | 4865804016353280000 |
21 | 102181884343418880000 |
22 | 2248001455555215360000 |
[0,2,4,12,48,240,1440,10080,80640,725760,7257600, 79833600,958003200,12454041600,174356582400, 2615348736000,41845579776000,711374856192000, 12804747411456000,243290200817664000, 4865804016353280000,102181884343418880000, 2248001455555215360000] |