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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 16777216 |
| 5 | 437893890380859375 |
| 6 | 500702078263459319174537025249570888246709955377400223021257741084821677152403456 |
[1,1,4,27,16777216,437893890380859375, 50070207826345931917453702524957088824670995537740\ 0223021257741084821677152403456] |