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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 16 |
| 2 | 384 |
| 3 | 18432 |
| 4 | 1474560 |
| 5 | 176947200 |
| 6 | 29727129600 |
| 7 | 6658877030400 |
| 8 | 1917756584755200 |
| 9 | 690392370511872000 |
| 10 | 303772643025223680000 |
| 11 | 160391955517318103040000 |
| 12 | 100084580242806496296960000 |
| 13 | 72861574416763129304186880000 |
| 14 | 61203722510081028615516979200000 |
[2,16,384,18432,1474560,176947200,29727129600, 6658877030400,1917756584755200,690392370511872000, 303772643025223680000,160391955517318103040000, 100084580242806496296960000, 72861574416763129304186880000, 61203722510081028615516979200000] |