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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 2256 |
| 3 | 106032 |
| 4 | 4983504 |
| 5 | 234224688 |
| 6 | 11008560336 |
| 7 | 517402335792 |
| 8 | 24317909782224 |
| 9 | 1142941759764528 |
| 10 | 53718262708931688 |
| 11 | 2524758347319736320 |
| 12 | 118663642324025116416 |
| 13 | 5577191189229063412224 |
| 14 | 262127985893760478586112 |
[1,48,2256,106032,4983504,234224688,11008560336, 517402335792,24317909782224,1142941759764528, 53718262708931688,2524758347319736320, 118663642324025116416,5577191189229063412224, 262127985893760478586112] |