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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 17 |
| 3 | 61 |
| 4 | 213 |
| 5 | 829 |
| 6 | 3581 |
| 7 | 13821 |
| 8 | 54509 |
| 9 | 218121 |
| 10 | 882805 |
| 11 | 3519057 |
| 12 | 14066621 |
| 13 | 56236325 |
| 14 | 224958517 |
| 15 | 899680829 |
[1,5,17,61,213,829,3581,13821,54509,218121,882805, 3519057,14066621,56236325,224958517,899680829] |