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| n | a(n) |
|---|---|
| 1 | 48 |
| 2 | 4912 |
| 3 | 951040 |
| 4 | 234168152 |
| 5 | 66434312368 |
| 6 | 20573458824776 |
| 7 | 6752109661033720 |
| 8 | 2310220535915090896 |
[48,4912,951040,234168152,66434312368, 20573458824776,6752109661033720, 2310220535915090896] |