n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 12 |
5 | 72 |
6 | 336 |
7 | 2640 |
8 | 17760 |
9 | 175680 |
10 | 1543680 |
11 | 18385920 |
12 | 199019520 |
13 | 2771112960 |
14 | 35611269120 |
15 | 567422392320 |
16 | 8437755432960 |
17 | 151385755852800 |
18 | 2556188496691200 |
19 | 50989753530777600 |
20 | 963558923688345600 |
21 | 21152552961009254400 |
22 | 442230750973683302400 |
[1,1,2,6,12,72,336,2640,17760,175680,1543680, 18385920,199019520,2771112960,35611269120, 567422392320,8437755432960,151385755852800, 2556188496691200,50989753530777600, 963558923688345600,21152552961009254400, 442230750973683302400] |