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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 64 |
| 4 | 809 |
| 5 | 13846 |
| 6 | 301262 |
| 7 | 8035168 |
| 8 | 255780779 |
| 9 | 9519891214 |
| 10 | 407613033836 |
| 11 | 19816627136912 |
| 12 | 1082142442901863 |
| 13 | 65776576008442274 |
| 14 | 4416031241930248774 |
| 15 | 325289604104049686096 |
| 16 | 26137255635911145802777 |
| 17 | 2279186202842678350137218 |
| 18 | 214713550195887533572753024 |
[1,2,8,64,809,13846,301262,8035168,255780779, 9519891214,407613033836,19816627136912, 1082142442901863,65776576008442274, 4416031241930248774,325289604104049686096, 26137255635911145802777,2279186202842678350137218, 214713550195887533572753024] |