n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 97 |
6 | 573 |
7 | 3956 |
8 | 31286 |
9 | 278721 |
10 | 2761872 |
11 | 30129504 |
12 | 358814995 |
13 | 4631975384 |
14 | 64426566695 |
15 | 960541539817 |
16 | 15281342678897 |
17 | 258393612570435 |
18 | 4627594697852334 |
19 | 87503608832116848 |
20 | 1742117303112144503 |
21 | 36426089065072112322 |
22 | 798062496789307188134 |
[1,1,2,6,20,97,573,3956,31286,278721,2761872, 30129504,358814995,4631975384,64426566695, 960541539817,15281342678897,258393612570435, 4627594697852334,87503608832116848, 1742117303112144503,36426089065072112322, 798062496789307188134] |