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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 144 |
| 4 | 30240 |
| 5 | 4725 |
| 6 | 7983360 |
| 7 | 108972864000 |
| 8 | 8072064000 |
| 9 | 453682944000 |
| 10 | 403179783552000 |
| 11 | 1250891123328000 |
| 12 | 179527894020034560000 |
| 13 | 42009527200688087040000 |
| 14 | 9335450489041797120000 |
[2,3,144,30240,4725,7983360,108972864000, 8072064000,453682944000,403179783552000, 1250891123328000,179527894020034560000, 42009527200688087040000,9335450489041797120000] |