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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 1584 |
| 4 | 463104 |
| 5 | 299289600 |
| 6 | 361552896000 |
| 7 | 732443959296000 |
| 8 | 2305449150971904000 |
| 9 | 10654390419268829184000 |
| 10 | 69202145783548005580800000 |
| 11 | 610152377325314475294720000000 |
| 12 | 7098963015274747190071787520000000 |
| 13 | 106459726394067298796772293345280000000 |
| 14 | 2017443502989317777418537171765166080000000 |
[1,16,1584,463104,299289600,361552896000, 732443959296000,2305449150971904000, 10654390419268829184000, 69202145783548005580800000, 610152377325314475294720000000, 7098963015274747190071787520000000, 106459726394067298796772293345280000000, 2017443502989317777418537171765166080000000] |