n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 18 |
3 | 1 |
4 | 1440 |
5 | 1 |
6 | 75600 |
7 | 1 |
8 | 3628800 |
9 | 1 |
10 | 167650560 |
11 | 1 |
12 | 5230697472000 |
13 | 1 |
14 | 336259123200 |
15 | 1 |
16 | 53353114214400000 |
17 | 1 |
18 | 28100018194440192000 |
19 | 1 |
20 | 4817145976189747200000 |
21 | 1 |
22 | 91657150256046735360000 |
23 | 1 |
[1,5,18,1,1440,1,75600,1,3628800,1,167650560,1, 5230697472000,1,336259123200,1,53353114214400000, 1,28100018194440192000,1,4817145976189747200000,1, 91657150256046735360000,1] |