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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 243 |
| 4 | 90624 |
| 5 | 85137125 |
| 6 | 166983141708 |
| 7 | 584752700234290 |
| 8 | 3335932982893551104 |
| 9 | 28979545952901285126801 |
| 10 | 364345886028800419659490500 |
| 11 | 6369639791888600743755572216796 |
| 12 | 149926538998807813901526056378836416 |
| 13 | 4626572216398455689960837772846170271886 |
| 14 | 183057653659252604698726467223480475509456616 |
| 15 | 9112803025595308606953230928489236750492759413500 |
[1,4,243,90624,85137125,166983141708, 584752700234290,3335932982893551104, 28979545952901285126801, 364345886028800419659490500, 6369639791888600743755572216796, 149926538998807813901526056378836416, 4626572216398455689960837772846170271886, 183057653659252604698726467223480475509456616, 9112803025595308606953230928489236750492759413500] |