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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 729 |
| 4 | 6084 |
| 5 | 49284 |
| 6 | 386884 |
| 7 | 2965284 |
| 8 | 22268961 |
| 9 | 164378041 |
| 10 | 1195430625 |
| 11 | 8581613769 |
| 12 | 60904316944 |
| 13 | 427872974400 |
| 14 | 2978730810000 |
| 15 | 20567785069584 |
| 16 | 140966727989481 |
| 17 | 959632952511249 |
| 18 | 6492348190361881 |
| 19 | 43674091151207841 |
[9,81,729,6084,49284,386884,2965284,22268961, 164378041,1195430625,8581613769,60904316944, 427872974400,2978730810000,20567785069584, 140966727989481,959632952511249,6492348190361881, 43674091151207841] |