n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 12 |
6 | 36 |
7 | 144 |
8 | 576 |
9 | 2880 |
10 | 14400 |
11 | 86400 |
12 | 518400 |
13 | 3628800 |
14 | 25401600 |
15 | 203212800 |
16 | 1625702400 |
17 | 14631321600 |
18 | 131681894400 |
19 | 1316818944000 |
20 | 13168189440000 |
21 | 144850083840000 |
22 | 1593350922240000 |
23 | 19120211066880000 |
24 | 229442532802560000 |
25 | 2982752926433280000 |
[1,1,1,2,4,12,36,144,576,2880,14400,86400,518400, 3628800,25401600,203212800,1625702400,14631321600, 131681894400,1316818944000,13168189440000, 144850083840000,1593350922240000, 19120211066880000,229442532802560000, 2982752926433280000] |