n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 6 |
6 | 40 |
7 | 150 |
8 | 2100 |
9 | 14700 |
10 | 423360 |
11 | 5556600 |
12 | 325987200 |
13 | 8068183200 |
14 | 958961203200 |
15 | 44996257706400 |
16 | 10799101849536000 |
17 | 965169727802280000 |
18 | 466713183932835840000 |
19 | 79775138681769651120000 |
[1,1,1,3,6,40,150,2100,14700,423360,5556600, 325987200,8068183200,958961203200,44996257706400, 10799101849536000,965169727802280000, 466713183932835840000,79775138681769651120000] |