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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 66 |
| 3 | 1358 |
| 4 | 37592 |
| 5 | 1304536 |
| 6 | 54384080 |
| 7 | 2646247152 |
| 8 | 147186205056 |
| 9 | 9210766696320 |
| 10 | 640472632680192 |
| 11 | 48989958019395840 |
| 12 | 4087959251421060096 |
| 13 | 369547591764702870528 |
| 14 | 35976590549993421907968 |
| 15 | 3752609987262290143082496 |
| 16 | 417518648351593243448279040 |
[1,5,66,1358,37592,1304536,54384080,2646247152, 147186205056,9210766696320,640472632680192, 48989958019395840,4087959251421060096, 369547591764702870528,35976590549993421907968, 3752609987262290143082496, 417518648351593243448279040] |