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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 60 |
| 3 | 2520 |
| 4 | 1663200 |
| 5 | 3113510400 |
| 6 | 14820309504000 |
| 7 | 60822550204416000 |
| 8 | 1077167364120207360000 |
| 9 | 12280224991305141603532800000 |
| 10 | 4111419327088961408862781440000000 |
| 11 | 19116323737814368119883304974417920000000 |
| 12 | 1393855275548491962840419252226697986048000000000 |
| 13 | 30207631531686917818677566034256998753632256000000000 |
[6,60,2520,1663200,3113510400,14820309504000, 60822550204416000,1077167364120207360000, 12280224991305141603532800000, 4111419327088961408862781440000000, 19116323737814368119883304974417920000000, 1393855275548491962840419252226697986048000000000, 30207631531686917818677566034256998753632256000000\ 000] |