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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 9 |
| 3 | 88 |
| 4 | 855 |
| 5 | 8311 |
| 6 | 80784 |
| 7 | 785233 |
| 8 | 7632585 |
| 9 | 74189896 |
| 10 | 721137159 |
| 11 | 7009563703 |
| 12 | 68134033440 |
| 13 | 662273246881 |
| 14 | 6437397456009 |
| 15 | 62572489832248 |
| 16 | 608214190682295 |
| 17 | 5911935144966391 |
| 18 | 57464915639473584 |
| 19 | 558567786770026993 |
| 20 | 5429364490406558025 |
| 21 | 52774254921049211176 |
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