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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 2193 |
| 4 | 5782218987645 |
| 5 | 223567225753623833253893162919867828939456664850241 |
[1,2,9,2193,5782218987645, 22356722575362383325389316291986782893945666485024\ 1] |