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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 27 |
| 4 | 295 |
| 5 | 5538 |
| 6 | 187787 |
| 7 | 11937347 |
| 8 | 1373281599 |
| 9 | 286527796314 |
| 10 | 108679921617242 |
| 11 | 74775639068058776 |
[1,7,27,295,5538,187787,11937347,1373281599, 286527796314,108679921617242,74775639068058776] |