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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 560 |
| 4 | 19844 |
| 5 | 949632 |
| 6 | 57398980 |
| 7 | 4197775472 |
| 8 | 360541351092 |
| 9 | 35581415127200 |
| 10 | 3968076446262116 |
| 11 | 493536896206210320 |
| 12 | 67738259336620421140 |
| 13 | 10170114513821104697792 |
| 14 | 1658107523049271429191492 |
| 15 | 291735781263854493014688944 |
| 16 | 55097256018925972909190946932 |
[1,2,24,560,19844,949632,57398980,4197775472, 360541351092,35581415127200,3968076446262116, 493536896206210320,67738259336620421140, 10170114513821104697792,1658107523049271429191492, 291735781263854493014688944, 55097256018925972909190946932] |