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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7680 |
| 3 | 228096 |
| 4 | 6298560 |
| 5 | 162171072 |
| 6 | 4032737280 |
| 7 | 97662620160 |
| 8 | 2320483572864 |
| 9 | 54321921368064 |
| 10 | 1256772873968640 |
| 11 | 28798595015489856 |
| 12 | 654681579415674048 |
| 13 | 14783463288895694400 |
| 14 | 331920615489235774848 |
| 15 | 7415532825963054368832 |
[0,7680,228096,6298560,162171072,4032737280, 97662620160,2320483572864,54321921368064, 1256772873968640,28798595015489856, 654681579415674048,14783463288895694400, 331920615489235774848,7415532825963054368832] |