n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 5 |
4 | 12 |
5 | 40 |
6 | 132 |
7 | 564 |
8 | 2400 |
9 | 12576 |
10 | 65760 |
11 | 408960 |
12 | 2540160 |
13 | 18299520 |
14 | 131725440 |
15 | 1079205120 |
16 | 8836853760 |
17 | 81157386240 |
18 | 745047797760 |
19 | 7582159872000 |
20 | 77138417664000 |
21 | 861690783744000 |
22 | 9623448705024000 |
23 | 117074735382528000 |
[1,2,5,12,40,132,564,2400,12576,65760,408960, 2540160,18299520,131725440,1079205120,8836853760, 81157386240,745047797760,7582159872000, 77138417664000,861690783744000,9623448705024000, 117074735382528000] |