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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 31 |
| 4 | 373 |
| 5 | 22381 |
| 6 | 134287 |
| 7 | 3760037 |
| 8 | 481284737 |
| 9 | 25989375799 |
| 10 | 6237450191761 |
| 11 | 411671712656227 |
| 12 | 64220787174371413 |
| 13 | 73468580527480896473 |
| 14 | 1028560127384732550623 |
| 15 | 185140822929251859112141 |
[2,5,31,373,22381,134287,3760037,481284737, 25989375799,6237450191761,411671712656227, 64220787174371413,73468580527480896473, 1028560127384732550623,185140822929251859112141] |