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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 16 |
| 4 | 61 |
| 5 | 481 |
| 6 | 3632 |
| 7 | 56460 |
| 8 | 846246 |
| 9 | 26077855 |
| 10 | 775360108 |
| 11 | 47367748738 |
| 12 | 2788988175862 |
| 13 | 337520120950504 |
| 14 | 39370755765040186 |
| 15 | 9439231435010737547 |
| 16 | 2181450759732224994542 |
| 17 | 1036179888983780783839829 |
[1,2,4,16,61,481,3632,56460,846246,26077855, 775360108,47367748738,2788988175862, 337520120950504,39370755765040186, 9439231435010737547,2181450759732224994542, 1036179888983780783839829] |