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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 48 |
| 5 | 480 |
| 6 | 3840 |
| 7 | 46080 |
| 8 | 737280 |
| 9 | 10321920 |
| 10 | 247726080 |
| 11 | 7431782400 |
| 12 | 163499212800 |
| 13 | 2942985830400 |
| 14 | 76517631590400 |
| 15 | 2601599474073600 |
| 16 | 93657581066649600 |
| 17 | 1873151621332992000 |
| 18 | 52448245397323776000 |
| 19 | 1993033325098303488000 |
| 20 | 79721333003932139520000 |
| 21 | 2551082656125828464640000 |
| 22 | 107145471557284795514880000 |
| 23 | 4928691691635100593684480000 |
[1,2,8,48,480,3840,46080,737280,10321920, 247726080,7431782400,163499212800,2942985830400, 76517631590400,2601599474073600,93657581066649600, 1873151621332992000,52448245397323776000, 1993033325098303488000,79721333003932139520000, 2551082656125828464640000, 107145471557284795514880000, 4928691691635100593684480000] |