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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 11 |
| 5 | 77 |
| 6 | 1081 |
| 7 | 142531 |
| 8 | 41758027 |
| 9 | 1206670783 |
| 10 | 10654858617041 |
[1,1,1,11,77,1081,142531,41758027,1206670783, 10654858617041] |