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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 16 |
| 6 | 1540 |
| 7 | 176460 |
| 8 | 6332072 |
| 9 | 81841692 |
| 10 | 2434154301 |
| 11 | 124866787929 |
[1,1,1,1,16,1540,176460,6332072,81841692, 2434154301,124866787929] |