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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 9 |
| 3 | 23 |
| 4 | 70 |
| 5 | 256 |
| 6 | 1160 |
| 7 | 6599 |
| 8 | 48017 |
| 9 | 452518 |
| 10 | 5574706 |
| 11 | 90198548 |
| 12 | 1919074899 |
| 13 | 53620291147 |
| 14 | 1962114118390 |
| 15 | 93718030190126 |
| 16 | 5822768063787557 |
[2,4,9,23,70,256,1160,6599,48017,452518,5574706, 90198548,1919074899,53620291147,1962114118390, 93718030190126,5822768063787557] |