n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 53 |
5 | 211 |
6 | 938 |
7 | 4582 |
8 | 24349 |
9 | 139671 |
10 | 858745 |
11 | 5628789 |
12 | 39145021 |
13 | 287667582 |
14 | 2226033629 |
15 | 18082308403 |
16 | 153770703339 |
17 | 1365631349757 |
18 | 12638233544989 |
19 | 121640399661294 |
20 | 1215438543434225 |
21 | 12587691428792115 |
[1,2,5,15,53,211,938,4582,24349,139671,858745, 5628789,39145021,287667582,2226033629,18082308403, 153770703339,1365631349757,12638233544989, 121640399661294,1215438543434225, 12587691428792115] |