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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 15 |
| 4 | 24 |
| 5 | 162 |
| 6 | 792 |
| 7 | 5448 |
| 8 | 33090 |
| 9 | 213894 |
| 10 | 1362564 |
| 11 | 8905782 |
| 12 | 59041560 |
| 13 | 398430732 |
| 14 | 2716098852 |
| 15 | 18681957864 |
| 16 | 129449774976 |
[3,15,24,162,792,5448,33090,213894,1362564, 8905782,59041560,398430732,2716098852,18681957864, 129449774976] |