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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 167960 |
| 2 | 4936848280 |
| 3 | 44648855844320 |
| 4 | 165848175033726640 |
| 5 | 303282730418598205184 |
| 6 | 309490028060407426691200 |
[1,167960,4936848280,44648855844320, 165848175033726640,303282730418598205184, 309490028060407426691200] |