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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 18 |
| 4 | 180 |
| 5 | 4347 |
| 6 | 245511 |
| 7 | 33731424 |
| 8 | 11850958449 |
| 9 | 10823718435525 |
| 10 | 26127739209077469 |
| 11 | 169071160476526474689 |
| 12 | 2962647736390311022542681 |
| 13 | 141814999458311839862777779311 |
| 14 | 18682218330844513414826192858258922 |
[1,1,3,18,180,4347,245511,33731424,11850958449, 10823718435525,26127739209077469, 169071160476526474689,2962647736390311022542681, 141814999458311839862777779311, 18682218330844513414826192858258922] |