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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 80 |
| 3 | 38400 |
| 4 | 77875200 |
| 5 | 449711308800 |
| 6 | 5935407169536000 |
| 7 | 155268186793574400000 |
| 8 | 7282309435397819596800000 |
| 9 | 568366274740400734548787200000 |
| 10 | 69683365216674756749626756300800000 |
| 11 | 12818556197716658801397242655670272000000 |
| 12 | 3408069131098061826431206876376696094720000000 |
[2,80,38400,77875200,449711308800, 5935407169536000,155268186793574400000, 7282309435397819596800000, 568366274740400734548787200000, 69683365216674756749626756300800000, 12818556197716658801397242655670272000000, 3408069131098061826431206876376696094720000000] |