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| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 9360000 |
| 3 | 457002000000000 |
| 4 | 13946558535000000000000000 |
| 5 | 266009466302345390625000000000000000000 |
| 6 | 3171079936179764469273010253906250000000000000000000000 |
[120,9360000,457002000000000, 13946558535000000000000000, 266009466302345390625000000000000000000, 31710799361797644692730102539062500000000000000000\ 00000] |