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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 360 |
| 4 | 9104 |
| 5 | 246020 |
| 6 | 6940128 |
| 7 | 201819688 |
| 8 | 6003642144 |
| 9 | 181770021702 |
| 10 | 5581576203840 |
| 11 | 173384554507648 |
| 12 | 5438172832075920 |
[1,16,360,9104,246020,6940128,201819688, 6003642144,181770021702,5581576203840, 173384554507648,5438172832075920] |