n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 42 |
5 | 312 |
6 | 2520 |
7 | 22320 |
8 | 216720 |
9 | 2298240 |
10 | 26490240 |
11 | 330220800 |
12 | 4430764800 |
13 | 63707212800 |
14 | 977642265600 |
15 | 15953627289600 |
16 | 275919291648000 |
17 | 5042392363008000 |
18 | 97102667870208000 |
19 | 1965528727658496000 |
20 | 41724269440229376000 |
21 | 926935665115299840000 |
[1,6,42,312,2520,22320,216720,2298240,26490240, 330220800,4430764800,63707212800,977642265600, 15953627289600,275919291648000,5042392363008000, 97102667870208000,1965528727658496000, 41724269440229376000,926935665115299840000] |