The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 185 |
| 5 | 1257 |
| 6 | 8925 |
| 7 | 65445 |
| 8 | 491825 |
| 9 | 3768209 |
| 10 | 29324405 |
| 11 | 231153133 |
| 12 | 1841801065 |
| 13 | 14810069497 |
| 14 | 120029657805 |
| 15 | 979470140661 |
| 16 | 8040831465825 |
| 17 | 66361595715105 |
| 18 | 550284185213925 |
| 19 | 4582462506008253 |
| 20 | 38306388126997785 |
[0,1,5,29,185,1257,8925,65445,491825,3768209, 29324405,231153133,1841801065,14810069497, 120029657805,979470140661,8040831465825, 66361595715105,550284185213925,4582462506008253, 38306388126997785] |