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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 580 |
| 4 | 21420 |
| 5 | 1068480 |
| 6 | 67189248 |
| 7 | 5098406400 |
| 8 | 453030209280 |
| 9 | 46120247659200 |
| 10 | 5290918350734016 |
| 11 | 675157532791996800 |
| 12 | 94836990558591590400 |
| 13 | 14538639675855504384000 |
| 14 | 2415072877848471727687680 |
[1,2,24,580,21420,1068480,67189248,5098406400, 453030209280,46120247659200,5290918350734016, 675157532791996800,94836990558591590400, 14538639675855504384000,2415072877848471727687680] |