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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 160000 |
| 3 | 512000000000 |
| 4 | 655360000000000000000 |
| 5 | 335544320000000000000000000000000 |
| 6 | 68719476736000000000000000000000000000000000000 |
[1,20,160000,512000000000,655360000000000000000, 335544320000000000000000000000000, 68719476736000000000000000000000000000000000000] |