n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 10 |
4 | 90 |
5 | 1260 |
6 | 25200 |
7 | 680400 |
8 | 23814000 |
9 | 1047816000 |
10 | 56582064000 |
11 | 3677834160000 |
12 | 283193230320000 |
13 | 25487390728800000 |
14 | 2650688635795200000 |
15 | 315431947659628800000 |
16 | 42583312934049888000000 |
17 | 6472663565975582976000000 |
18 | 1100352806215849105920000000 |
[1,2,10,90,1260,25200,680400,23814000,1047816000, 56582064000,3677834160000,283193230320000, 25487390728800000,2650688635795200000, 315431947659628800000,42583312934049888000000, 6472663565975582976000000, 1100352806215849105920000000] |