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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 66 |
| 4 | 1317 |
| 5 | 115795 |
| 6 | 26488736 |
| 7 | 16946352492 |
| 8 | 30667098889607 |
| 9 | 150836015759040225 |
[1,7,66,1317,115795,26488736,16946352492, 30667098889607,150836015759040225] |