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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 768 |
| 2 | 61440 |
| 3 | 165150720 |
| 4 | 47563407360 |
| 5 | 669692775628800 |
| 6 | 417888291992371200 |
| 7 | 2808209322188734464000 |
| 8 | 3055331742541343096832000 |
| 9 | 33437550590372458851729408000 |
| 10 | 56175084991825730870905405440000 |
| 11 | 7276695809501137874093602599075840000 |
| 12 | 17464069942802730897824646237782016000000 |
[4,768,61440,165150720,47563407360, 669692775628800,417888291992371200, 2808209322188734464000,3055331742541343096832000, 33437550590372458851729408000, 56175084991825730870905405440000, 7276695809501137874093602599075840000, 17464069942802730897824646237782016000000] |