n | a(n) |
---|---|
1 | 1 |
2 | 5 |
3 | 15 |
4 | 15 |
5 | 30 |
6 | 210 |
7 | 1050 |
8 | 6300 |
9 | 1045800 |
10 | 13756453200 |
11 | 67826316310678800 |
12 | 8622353329220210792550912000 |
13 | 92206830102396929163916671718833533307592704000 |
[1,5,15,15,30,210,1050,6300,1045800,13756453200, 67826316310678800,8622353329220210792550912000, 92206830102396929163916671718833533307592704000] |