n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 8 |
5 | 30 |
6 | 144 |
7 | 840 |
8 | 5760 |
9 | 45360 |
10 | 403200 |
11 | 3991680 |
12 | 43545600 |
13 | 518918400 |
14 | 6706022400 |
15 | 93405312000 |
16 | 1394852659200 |
17 | 22230464256000 |
18 | 376610217984000 |
19 | 6758061133824000 |
20 | 128047474114560000 |
21 | 2554547108585472000 |
22 | 53523844179886080000 |
23 | 1175091669949317120000 |
[1,1,3,8,30,144,840,5760,45360,403200,3991680, 43545600,518918400,6706022400,93405312000, 1394852659200,22230464256000,376610217984000, 6758061133824000,128047474114560000, 2554547108585472000,53523844179886080000, 1175091669949317120000] |