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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 2917 |
| 6 | 1005227383127 |
| 7 | 960336157066554685167071011848947459782832 |
[1,1,1,2,9,2917,1005227383127, 960336157066554685167071011848947459782832] |