n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 16 |
5 | 54 |
6 | 232 |
7 | 936 |
8 | 3880 |
9 | 17302 |
10 | 81584 |
11 | 409012 |
12 | 2169742 |
13 | 11998726 |
14 | 69653068 |
15 | 426511054 |
16 | 2718410098 |
17 | 18114464012 |
[1,2,6,16,54,232,936,3880,17302,81584,409012, 2169742,11998726,69653068,426511054,2718410098, 18114464012] |