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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 10 |
| 4 | 84 |
| 5 | 1308 |
| 6 | 50500 |
| 7 | 5934606 |
| 8 | 3733057244 |
| 9 | 7484174351906 |
| 10 | 30512551214306088 |
[2,10,84,1308,50500,5934606,3733057244, 7484174351906,30512551214306088] |