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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 36 |
| 3 | 3178 |
| 4 | 298908192 |
| 5 | 165073828103027338592 |
| 6 | 6487168790978377311010208151738379048817328948 |
[4,36,3178,298908192,165073828103027338592, 6487168790978377311010208151738379048817328948] |