n | a(n) |
---|---|
2 | 1 |
3 | 3 |
4 | 11 |
5 | 57 |
6 | 360 |
7 | 2428 |
8 | 19692 |
9 | 178096 |
10 | 1814400 |
11 | 19748160 |
12 | 237351468 |
13 | 3091307829 |
14 | 43589145600 |
15 | 650470873262 |
16 | 10415387654044 |
17 | 177171175431551 |
18 | 3201186852864000 |
19 | 60647963017860105 |
20 | 1213361365706836584 |
21 | 25488014447816087399 |
22 | 562000363888803840000 |
[1,3,11,57,360,2428,19692,178096,1814400,19748160, 237351468,3091307829,43589145600,650470873262, 10415387654044,177171175431551,3201186852864000, 60647963017860105,1213361365706836584, 25488014447816087399,562000363888803840000] |