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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 16 |
| 3 | 184 |
| 4 | 8320 |
| 5 | 529824 |
| 6 | 52633728 |
| 7 | 7595502464 |
| 8 | 1487529832448 |
| 9 | 380497987834368 |
| 10 | 123182327672588288 |
| 11 | 49234752596303947776 |
| 12 | 23812565081465676070912 |
| 13 | 13707078729819239829938176 |
[1,4,16,184,8320,529824,52633728,7595502464, 1487529832448,380497987834368,123182327672588288, 49234752596303947776,23812565081465676070912, 13707078729819239829938176] |