n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 14 |
4 | 52 |
5 | 248 |
6 | 1416 |
7 | 9172 |
8 | 66366 |
9 | 518868 |
10 | 4301350 |
11 | 37230364 |
12 | 333058463 |
13 | 3057319072 |
14 | 28656583950 |
15 | 273298352168 |
16 | 2645186193457 |
17 | 25931472185976 |
[1,2,4,14,52,248,1416,9172,66366,518868,4301350, 37230364,333058463,3057319072,28656583950, 273298352168,2645186193457,25931472185976] |