| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 81 |
| 3 | 738 |
| 4 | 6642 |
| 5 | 59787 |
| 6 | 544644 |
| 7 | 4901805 |
| 8 | 44129367 |
| 9 | 401947281 |
| 10 | 3617545212 |
| 11 | 32572255824 |
| 12 | 296637113061 |
| 13 | 2669762715372 |
| 14 | 24041811608757 |
| 15 | 218918218136841 |
| 16 | 1970298831114945 |
| 17 | 17745398880920694 |
| 18 | 161561679852872034 |
[1,9,81,738,6642,59787,544644,4901805,44129367, 401947281,3617545212,32572255824,296637113061, 2669762715372,24041811608757,218918218136841, 1970298831114945,17745398880920694, 161561679852872034] |