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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 80 |
| 3 | 711 |
| 4 | 6318 |
| 5 | 56143 |
| 6 | 498896 |
| 7 | 4433274 |
| 8 | 39394819 |
| 9 | 350068993 |
| 10 | 3110771999 |
| 11 | 27642843622 |
| 12 | 245638961566 |
| 13 | 2182789161071 |
| 14 | 19396631915857 |
| 15 | 172361736254288 |
| 16 | 1531635402139359 |
| 17 | 13610370004776711 |
| 18 | 120944038906506659 |
| 19 | 1074729088326395697 |
| 20 | 9550223588843166996 |
[1,9,80,711,6318,56143,498896,4433274,39394819, 350068993,3110771999,27642843622,245638961566, 2182789161071,19396631915857,172361736254288, 1531635402139359,13610370004776711, 120944038906506659,1074729088326395697, 9550223588843166996] |