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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 56628 |
| 3 | 41983200 |
| 4 | 38244074820 |
| 5 | 39137678949600 |
| 6 | 43169977801676880 |
| 7 | 50180219346847075200 |
| 8 | 60633191914827463116900 |
| 9 | 75481112829367580702796000 |
| 10 | 96214948596107910313766029008 |
| 11 | 125026188575803676432586848856960 |
| 12 | 165076420520740156599642652986224784 |
[1,120,56628,41983200,38244074820,39137678949600, 43169977801676880,50180219346847075200, 60633191914827463116900, 75481112829367580702796000, 96214948596107910313766029008, 125026188575803676432586848856960, 165076420520740156599642652986224784] |