n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 5 |
4 | 2 |
5 | 34 |
6 | 324 |
7 | 2988 |
8 | 28944 |
9 | 300816 |
10 | 3371040 |
11 | 793440 |
12 | 49438080 |
13 | 1121696640 |
14 | 21930773760 |
15 | 416139897600 |
16 | 7965912729600 |
17 | 156343306291200 |
18 | 3169866941337600 |
19 | 66629845591142400 |
20 | 1454242012231680000 |
[0,1,5,2,34,324,2988,28944,300816,3371040,793440, 49438080,1121696640,21930773760,416139897600, 7965912729600,156343306291200,3169866941337600, 66629845591142400,1454242012231680000] |