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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 89 |
| 4 | 809 |
| 5 | 7369 |
| 6 | 66329 |
| 7 | 597769 |
| 8 | 5380009 |
| 9 | 48426649 |
| 10 | 435840569 |
| 11 | 3922624969 |
| 12 | 35303624809 |
| 13 | 317733161289 |
| 14 | 2859598458169 |
| 15 | 25736390906489 |
| 16 | 231627518218169 |
| 17 | 2084647707070009 |
| 18 | 18761829363630889 |
| 19 | 168856464660630009 |
| 20 | 1519708181946200889 |
| 21 | 13677373641002598169 |
[1,9,89,809,7369,66329,597769,5380009,48426649, 435840569,3922624969,35303624809,317733161289, 2859598458169,25736390906489,231627518218169, 2084647707070009,18761829363630889, 168856464660630009,1519708181946200889, 13677373641002598169] |