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| n | a(n) |
|---|---|
| 1 | 2196 |
| 2 | 1203222 |
| 3 | 310664552 |
| 4 | 69027667944 |
| 5 | 14999158146398 |
| 6 | 3239971166331308 |
[2196,1203222,310664552,69027667944, 14999158146398,3239971166331308] |