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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 61 |
| 4 | 821 |
| 5 | 4201 |
| 6 | 270131 |
| 7 | 61277761 |
| 8 | 274359834731 |
| 9 | 23888027348153 |
| 10 | 86936981079782063 |
| 11 | 4243031147170261950811 |
| 12 | 272838646828154727511151 |
| 13 | 821882010875193363312928672952261 |
[2,23,61,821,4201,270131,61277761,274359834731, 23888027348153,86936981079782063, 4243031147170261950811,272838646828154727511151, 821882010875193363312928672952261] |