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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 16 |
| 3 | 52 |
| 4 | 174 |
| 5 | 618 |
| 6 | 2300 |
| 7 | 8764 |
| 8 | 34038 |
| 9 | 133858 |
| 10 | 530876 |
| 11 | 2112904 |
| 12 | 8417830 |
| 13 | 33592910 |
| 14 | 134211556 |
| 15 | 536403988 |
| 16 | 2144322638 |
[2,5,16,52,174,618,2300,8764,34038,133858,530876, 2112904,8417830,33592910,134211556,536403988, 2144322638] |