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| n | a(n) |
|---|---|
| 0 | 17 |
| 1 | 18 |
| 2 | 125 |
| 3 | 643 |
| 4 | 768 |
| 5 | 3715 |
| 6 | 11913 |
| 7 | 15628 |
| 8 | 58797 |
| 9 | 250816 |
| 10 | 309613 |
| 11 | 1798881 |
| 12 | 11102899 |
| 13 | 12901780 |
| 14 | 449763419 |
| 15 | 462665199 |
| 16 | 3225754613 |
| 17 | 16591438264 |
| 18 | 19817192877 |
| 19 | 95860209772 |
| 20 | 307397822193 |
| 21 | 403258031965 |
[17,18,125,643,768,3715,11913,15628,58797,250816, 309613,1798881,11102899,12901780,449763419, 462665199,3225754613,16591438264,19817192877, 95860209772,307397822193,403258031965] |