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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 4 |
| 3 | 196 |
| 4 | 968 |
| 5 | 8712 |
| 6 | 437400 |
| 7 | 85730400 |
| 8 | 5030690600 |
| 9 | 264615012500 |
| 10 | 5239012864 |
| 11 | 550886816376 |
| 12 | 2494017320776852 |
[16,4,196,968,8712,437400,85730400,5030690600, 264615012500,5239012864,550886816376, 2494017320776852] |