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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 73 |
| 4 | 257 |
| 5 | 1082401 |
| 6 | 4033 |
| 7 | 4432676798593 |
| 8 | 4294967297 |
| 9 | 18014398643699713 |
| 10 | 1098438933505 |
| 11 | 1298708349570020393652962442872833 |
| 12 | 281474959933441 |
| 13 | 91355004067076339167413824240109498970069278721 |
[1,5,73,257,1082401,4033,4432676798593,4294967297, 18014398643699713,1098438933505, 1298708349570020393652962442872833, 281474959933441, 91355004067076339167413824240109498970069278721] |