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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 24 |
| 4 | 89 |
| 5 | 507 |
| 6 | 1913 |
| 7 | 10832 |
| 8 | 41485 |
| 9 | 234997 |
| 10 | 909772 |
| 11 | 5161736 |
| 12 | 20142456 |
| 13 | 114475100 |
| 14 | 449409816 |
| 15 | 2558062376 |
| 16 | 10089877429 |
| 17 | 57509594605 |
| 18 | 227694240418 |
| 19 | 1299311929720 |
| 20 | 5160174433873 |
| 21 | 29475731911575 |
| 22 | 117362831079013 |
| 23 | 670984236347368 |
[1,4,24,89,507,1913,10832,41485,234997,909772, 5161736,20142456,114475100,449409816,2558062376, 10089877429,57509594605,227694240418, 1299311929720,5160174433873,29475731911575, 117362831079013,670984236347368] |