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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 125 |
| 4 | 4913 |
| 5 | 274625 |
| 6 | 16974593 |
| 7 | 1076890625 |
| 8 | 68769820673 |
| 9 | 4398851866625 |
| 10 | 281487861809153 |
| 11 | 18014604668698625 |
| 12 | 1152924803144876033 |
| 13 | 73787029071408922625 |
| 14 | 4722367327294625677313 |
| 15 | 302231468414456377114625 |
| 16 | 19342813330006849714388993 |
| 17 | 1237940042744144791940890625 |
| 18 | 79228162569604569827557507073 |
[0,1,125,4913,274625,16974593,1076890625, 68769820673,4398851866625,281487861809153, 18014604668698625,1152924803144876033, 73787029071408922625,4722367327294625677313, 302231468414456377114625, 19342813330006849714388993, 1237940042744144791940890625, 79228162569604569827557507073] |