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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 5 |
| 4 | 5 |
| 5 | 1571 |
| 6 | 2693 |
| 7 | 15427 |
| 8 | 27749 |
| 9 | 4154449757 |
| 10 | 151585363459003 |
| 11 | 73899633146196133 |
| 12 | 24770877398207 |
| 13 | 1429176066859677377 |
| 14 | 7748318379505746557 |
| 15 | 21662673895172922098651 |
[2,2,5,5,1571,2693,15427,27749,4154449757, 151585363459003,73899633146196133,24770877398207, 1429176066859677377,7748318379505746557, 21662673895172922098651] |