| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 231 |
| 4 | 12403 |
| 5 | 24531 |
| 6 | 235641 |
| 7 | 2467531 |
| 8 | 13862745 |
| 9 | 153694278 |
| 10 | 10429651378 |
| 11 | 1017139458621 |
| 12 | 101114872391625 |
| 13 | 10111496127133528 |
| 14 | 1011137441915312286 |
| 15 | 101111293764315411825 |
| 16 | 10111111491815764232356 |
| 17 | 1011111155214617733491628 |
| 18 | 101111111617874325294116835 |
[1,21,231,12403,24531,235641,2467531,13862745, 153694278,10429651378,1017139458621, 101114872391625,10111496127133528, 1011137441915312286,101111293764315411825, 10111111491815764232356,1011111155214617733491628, 101111111617874325294116835] |