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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 148 |
| 4 | 5821348 |
| 5 | 13748537282247342677718148 |
| 6 | 49900608324196518198677680899235165296598423281799348 |
[1,4,148,5821348,13748537282247342677718148, 49900608324196518198677680899235165296598423281799\ 348] |