n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 18 |
6 | 72 |
7 | 360 |
8 | 1800 |
9 | 10800 |
10 | 75600 |
11 | 529200 |
12 | 4233600 |
13 | 38102400 |
14 | 342921600 |
15 | 3429216000 |
16 | 37721376000 |
17 | 414935136000 |
18 | 4979221632000 |
19 | 64729881216000 |
20 | 841488455808000 |
21 | 11780838381312000 |
22 | 176712575719680000 |
[1,1,1,2,6,18,72,360,1800,10800,75600,529200, 4233600,38102400,342921600,3429216000,37721376000, 414935136000,4979221632000,64729881216000, 841488455808000,11780838381312000, 176712575719680000] |