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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 27 |
| 4 | 81 |
| 5 | 3125 |
| 6 | 15625 |
| 7 | 823543 |
| 8 | 5764801 |
| 9 | 40353607 |
| 10 | 282475249 |
| 11 | 285311670611 |
| 12 | 3138428376721 |
| 13 | 302875106592253 |
| 14 | 3937376385699289 |
| 15 | 51185893014090757 |
| 16 | 665416609183179841 |
| 17 | 827240261886336764177 |
| 18 | 14063084452067724991009 |
[0,4,27,81,3125,15625,823543,5764801,40353607, 282475249,285311670611,3138428376721, 302875106592253,3937376385699289, 51185893014090757,665416609183179841, 827240261886336764177,14063084452067724991009] |