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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 23 |
| 2 | 1199 |
| 3 | 1672799 |
| 4 | 2821066795199 |
| 5 | 7958661108093376400572799 |
| 6 | 63340286662973277702728603126500927381164903187199 |
[1,23,1199,1672799,2821066795199, 7958661108093376400572799, 63340286662973277702728603126500927381164903187199\ ] |