n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 15 |
3 | 45 |
4 | 165 |
5 | 629 |
6 | 2635 |
7 | 11165 |
8 | 48915 |
9 | 217045 |
10 | 976887 |
11 | 4438925 |
12 | 20346485 |
13 | 93900245 |
14 | 435970995 |
15 | 2034505661 |
16 | 9536767665 |
17 | 44878791365 |
18 | 211927736135 |
19 | 1003867701485 |
20 | 4768372070757 |
21 | 22706531350485 |
22 | 108372083629275 |
23 | 518301258916445 |
[1,5,15,45,165,629,2635,11165,48915,217045,976887, 4438925,20346485,93900245,435970995,2034505661, 9536767665,44878791365,211927736135,1003867701485, 4768372070757,22706531350485,108372083629275, 518301258916445] |