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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 27310 |
| 6 | 4493895 |
| 7 | 469762041 |
| 8 | 39763084319 |
| 9 | 3062924462367 |
| 10 | 231122336887800 |
| 11 | 16732612596774745 |
| 12 | 1176767971442596731 |
| 13 | 80630592887297229153 |
| 14 | 5290690279278336041746 |
| 15 | 330378602282944731759075 |
[1,3,6,27310,4493895,469762041,39763084319, 3062924462367,231122336887800,16732612596774745, 1176767971442596731,80630592887297229153, 5290690279278336041746,330378602282944731759075] |