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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 81 |
| 3 | 15625 |
| 4 | 5764801 |
| 5 | 3486784401 |
| 6 | 3138428376721 |
| 7 | 3937376385699289 |
| 8 | 6568408355712890625 |
| 9 | 14063084452067724991009 |
| 10 | 37589973457545958193355601 |
| 11 | 122694327386105632949003612841 |
| 12 | 480250763996501976790165756943041 |
| 13 | 2220446049250313080847263336181640625 |
[1,81,15625,5764801,3486784401,3138428376721, 3937376385699289,6568408355712890625, 14063084452067724991009, 37589973457545958193355601, 122694327386105632949003612841, 480250763996501976790165756943041, 2220446049250313080847263336181640625] |