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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 82 |
| 3 | 765 |
| 4 | 7129 |
| 5 | 66420 |
| 6 | 618841 |
| 7 | 5765805 |
| 8 | 53720578 |
| 9 | 500519961 |
| 10 | 4663394209 |
| 11 | 43449307200 |
| 12 | 404821512289 |
| 13 | 3771762252921 |
| 14 | 35141883671458 |
| 15 | 327420421852365 |
| 16 | 3050608602778201 |
| 17 | 28422823459498740 |
| 18 | 264818270254044889 |
| 19 | 2467338136208552925 |
| 20 | 22988434568917776562 |
| 21 | 214185529001504000169 |
[1,9,82,765,7129,66420,618841,5765805,53720578, 500519961,4663394209,43449307200,404821512289, 3771762252921,35141883671458,327420421852365, 3050608602778201,28422823459498740, 264818270254044889,2467338136208552925, 22988434568917776562,214185529001504000169] |