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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 72 |
| 4 | 9780 |
| 5 | 668362 |
| 6 | 173484536 |
| 7 | 10081326340 |
| 8 | 182802386772 |
| 9 | 1760679542512 |
| 10 | 11472302452452 |
[0,72,9780,668362,173484536,10081326340, 182802386772,1760679542512,11472302452452] |