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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 38 |
| 5 | 587 |
| 6 | 9649 |
| 7 | 374209 |
| 8 | 27337248 |
| 9 | 3366388352 |
| 10 | 804248984354 |
[1,2,8,38,587,9649,374209,27337248,3366388352, 804248984354] |