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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 1875 |
| 3 | 50553 |
| 4 | 1412907 |
| 5 | 39868737 |
| 6 | 1127761923 |
| 7 | 31921015497 |
| 8 | 903661481115 |
| 9 | 25583075832465 |
| 10 | 724276345970163 |
| 11 | 20504869741550745 |
| 12 | 580510427181846027 |
| 13 | 16434750355138945761 |
| 14 | 465281963351360897763 |
| 15 | 13172534004090254190441 |
[81,1875,50553,1412907,39868737,1127761923, 31921015497,903661481115,25583075832465, 724276345970163,20504869741550745, 580510427181846027,16434750355138945761, 465281963351360897763,13172534004090254190441] |