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| n | a(n) |
|---|---|
| 3 | 108 |
| 4 | 614 |
| 5 | 3840 |
| 6 | 26937 |
| 7 | 211722 |
| 8 | 1852300 |
| 9 | 17900118 |
| 10 | 189670655 |
| 11 | 2188938928 |
| 12 | 27349969842 |
[108,614,3840,26937,211722,1852300,17900118, 189670655,2188938928,27349969842] |