n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 6 |
6 | 60 |
7 | 120 |
8 | 1920 |
9 | 7560 |
10 | 90720 |
11 | 362880 |
12 | 13305600 |
13 | 39916800 |
14 | 1037836800 |
15 | 10897286400 |
16 | 265686220800 |
17 | 1307674368000 |
18 | 66691392768000 |
19 | 355687428096000 |
20 | 20274183401472000 |
21 | 202741834014720000 |
[1,1,1,4,6,60,120,1920,7560,90720,362880,13305600, 39916800,1037836800,10897286400,265686220800, 1307674368000,66691392768000,355687428096000, 20274183401472000,202741834014720000] |