n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 237 |
7 | 1591 |
8 | 11795 |
9 | 99651 |
10 | 928507 |
11 | 9474043 |
12 | 104866399 |
13 | 1249073623 |
14 | 15914416345 |
15 | 215724860511 |
16 | 3097002496225 |
17 | 46904398032017 |
18 | 746831626559889 |
19 | 12463977258581151 |
20 | 217445976215654257 |
21 | 3956098180940284169 |
22 | 74897945785223884653 |
[1,1,1,3,9,45,237,1591,11795,99651,928507,9474043, 104866399,1249073623,15914416345,215724860511, 3097002496225,46904398032017,746831626559889, 12463977258581151,217445976215654257, 3956098180940284169,74897945785223884653] |