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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 1323 |
| 3 | 52542 |
| 4 | 1965330 |
| 5 | 63015581 |
| 6 | 1919539785 |
| 7 | 54600088140 |
| 8 | 1497422284157 |
| 9 | 39564274878078 |
| 10 | 1019357844042958 |
| 11 | 25666134197134128 |
| 12 | 635034954062340420 |
| 13 | 15473668537066693635 |
| 14 | 372414770834024213537 |
| 15 | 8868326255432266486264 |
[21,1323,52542,1965330,63015581,1919539785, 54600088140,1497422284157,39564274878078, 1019357844042958,25666134197134128, 635034954062340420,15473668537066693635, 372414770834024213537,8868326255432266486264] |