n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 7 |
4 | 20 |
5 | 70 |
6 | 234 |
7 | 832 |
8 | 2956 |
9 | 10759 |
10 | 39394 |
11 | 145892 |
12 | 543564 |
13 | 2038831 |
14 | 7684116 |
15 | 29092055 |
16 | 110550260 |
17 | 421495147 |
18 | 1611662256 |
[1,2,7,20,70,234,832,2956,10759,39394,145892, 543564,2038831,7684116,29092055,110550260, 421495147,1611662256] |