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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 270 |
| 4 | 900 |
| 5 | 2100 |
| 6 | 4900 |
| 7 | 9450 |
| 8 | 18225 |
| 9 | 31185 |
| 10 | 53361 |
| 11 | 84084 |
| 12 | 132496 |
| 13 | 196560 |
| 14 | 291600 |
| 15 | 413100 |
| 16 | 585225 |
| 17 | 799425 |
| 18 | 1092025 |
| 19 | 1448370 |
| 20 | 1920996 |
| 21 | 2486484 |
| 22 | 3218436 |
| 23 | 4081350 |
| 24 | 5175625 |
| 25 | 6449625 |
| 26 | 8037225 |
| 27 | 9865800 |
| 28 | 12110400 |
| 29 | 14671680 |
| 30 | 17774656 |
[9,81,270,900,2100,4900,9450,18225,31185,53361, 84084,132496,196560,291600,413100,585225,799425, 1092025,1448370,1920996,2486484,3218436,4081350, 5175625,6449625,8037225,9865800,12110400,14671680, 17774656] |