n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 120 |
6 | 660 |
7 | 4200 |
8 | 30688 |
9 | 254016 |
10 | 2352240 |
11 | 24108480 |
12 | 271016064 |
13 | 3316135680 |
14 | 43877957760 |
15 | 624306009600 |
16 | 9505324339200 |
17 | 154205312163840 |
18 | 2655567756979200 |
19 | 48382249157222400 |
20 | 929788248840192000 |
21 | 18796669969158144000 |
22 | 398766195659497881600 |
[0,0,0,0,24,120,660,4200,30688,254016,2352240, 24108480,271016064,3316135680,43877957760, 624306009600,9505324339200,154205312163840, 2655567756979200,48382249157222400, 929788248840192000,18796669969158144000, 398766195659497881600] |