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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 624 |
| 5 | 110880 |
| 6 | 58769280 |
| 7 | 67704940800 |
| 8 | 149428671436800 |
| 9 | 574091539551129600 |
| 10 | 3581833707481042944000 |
| 11 | 34393612685291413069824000 |
| 12 | 486990328595374993951457280000 |
| 13 | 9818890674272030616178239406080000 |
| 14 | 273823820339488809857168046768783360000 |
[1,2,12,624,110880,58769280,67704940800, 149428671436800,574091539551129600, 3581833707481042944000,34393612685291413069824000, 486990328595374993951457280000, 9818890674272030616178239406080000, 273823820339488809857168046768783360000] |