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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 41 |
| 3 | 89814 |
| 4 | 98285430640360 |
| 5 | 22352043009017562549812304739324022523 |
[1,4,41,89814,98285430640360, 22352043009017562549812304739324022523] |