n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 6 |
7 | 8 |
8 | 40 |
9 | 720 |
10 | 560 |
11 | 4480 |
12 | 362880 |
13 | 1209600 |
14 | 13305600 |
15 | 479001600 |
16 | 188697600 |
17 | 2641766400 |
18 | 1307674368000 |
19 | 774918144000 |
20 | 1197600768000 |
21 | 44771844096000 |
22 | 3119105138688000 |
23 | 73724303278080000 |
24 | 4644631106519040000 |
25 | 374666909259202560000 |
26 | 8617338912961658880000 |
[1,1,1,1,1,2,6,8,40,720,560,4480,362880,1209600, 13305600,479001600,188697600,2641766400, 1307674368000,774918144000,1197600768000, 44771844096000,3119105138688000,73724303278080000, 4644631106519040000,374666909259202560000, 8617338912961658880000] |