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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 192 |
| 3 | 3840 |
| 4 | 92160 |
| 5 | 2580480 |
| 6 | 82575360 |
| 7 | 2972712960 |
| 8 | 118908518400 |
| 9 | 5231974809600 |
| 10 | 251134790860800 |
| 11 | 13059009124761600 |
| 12 | 731304510986649600 |
| 13 | 43878270659198976000 |
| 14 | 2808209322188734464000 |
| 15 | 190958233908833943552000 |
[1,12,192,3840,92160,2580480,82575360,2972712960, 118908518400,5231974809600,251134790860800, 13059009124761600,731304510986649600, 43878270659198976000,2808209322188734464000, 190958233908833943552000] |