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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 36 |
| 5 | 1536 |
| 6 | 116954 |
| 7 | 27354464 |
| 8 | 16992197390 |
| 9 | 27071152148341 |
| 10 | 112124137590207769 |
[0,1,3,36,1536,116954,27354464,16992197390, 27071152148341,112124137590207769] |