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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 78 |
| 4 | 19656 |
| 5 | 61405344 |
| 6 | 2863085569344 |
| 7 | 2357871215948696448 |
| 8 | 39557911075122642360238080 |
| 9 | 15325544184478930809864207383592960 |
| 10 | 153255393906487099048546500580688904121221120 |
[1,1,3,78,19656,61405344,2863085569344, 2357871215948696448,39557911075122642360238080, 15325544184478930809864207383592960, 153255393906487099048546500580688904121221120] |