n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 11 |
4 | 50 |
5 | 275 |
6 | 1560 |
7 | 9212 |
8 | 56082 |
9 | 348675 |
10 | 2207120 |
11 | 14171155 |
12 | 92075064 |
13 | 604266000 |
14 | 3999688050 |
15 | 26670727220 |
16 | 178997024610 |
17 | 1208160130227 |
18 | 8195828345756 |
19 | 55849242272130 |
20 | 382119958804520 |
21 | 2624041637846210 |
[1,1,2,11,50,275,1560,9212,56082,348675,2207120, 14171155,92075064,604266000,3999688050, 26670727220,178997024610,1208160130227, 8195828345756,55849242272130,382119958804520, 2624041637846210] |