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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 81 |
| 3 | 6819 |
| 4 | 3447649 |
| 5 | 8779228417 |
| 6 | 105855104360481 |
| 7 | 6152504033864688529 |
| 8 | 1755834487701036618450529 |
[3,81,6819,3447649,8779228417,105855104360481, 6152504033864688529,1755834487701036618450529] |