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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 72 |
| 2 | 4176 |
| 3 | 731808 |
| 4 | 381879360 |
| 5 | 592267282560 |
| 6 | 2733202405059840 |
| 7 | 37590062966534453760 |
| 8 | 1542797317119230338360320 |
| 9 | 189160927199005707074274969600 |
[4,72,4176,731808,381879360,592267282560, 2733202405059840,37590062966534453760, 1542797317119230338360320, 189160927199005707074274969600] |