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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 512 |
| 3 | 91125 |
| 4 | 26198073 |
| 5 | 12519490248 |
| 6 | 20301732352 |
| 7 | 87824421125 |
| 8 | 93824221184 |
| 9 | 121213882349 |
| 10 | 128711132649 |
| 11 | 162324571375 |
| 12 | 171323771464 |
| 13 | 368910352448 |
| 14 | 19902511000000 |
| 15 | 87782935806307 |
| 16 | 171471879319616 |
| 17 | 220721185826504 |
| 18 | 470511577514952 |
| 19 | 2977097087043793 |
| 20 | 9063181647017784 |
[1,512,91125,26198073,12519490248,20301732352, 87824421125,93824221184,121213882349,128711132649, 162324571375,171323771464,368910352448, 19902511000000,87782935806307,171471879319616, 220721185826504,470511577514952,2977097087043793, 9063181647017784] |