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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 81 |
| 3 | 18081 |
| 4 | 264639729 |
| 5 | 239657412990669 |
| 6 | 14022194613733384575957 |
| 7 | 55099298574634623527360069025765 |
[1,9,81,18081,264639729,239657412990669, 14022194613733384575957, 55099298574634623527360069025765] |