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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 86 |
| 5 | 698 |
| 6 | 9551 |
| 7 | 226592 |
| 8 | 9471845 |
| 9 | 695682342 |
| 10 | 86238293547 |
| 11 | 17168508065099 |
| 12 | 5086739366269620 |
| 13 | 2115486636919118021 |
[2,5,17,86,698,9551,226592,9471845,695682342, 86238293547,17168508065099,5086739366269620, 2115486636919118021] |