n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 2 |
4 | 6 |
5 | 18 |
6 | 198 |
7 | 6930 |
8 | 2737350 |
9 | 37936933650 |
10 | 207693292716721350 |
11 | 15758493330480878908260133650 |
12 | 6545866736124132578837836330405530973356721350 |
[1,2,2,6,18,198,6930,2737350,37936933650, 207693292716721350,15758493330480878908260133650, 6545866736124132578837836330405530973356721350] |