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| n | a(n) |
|---|---|
| 13 | 72 |
| 14 | 22702 |
| 15 | 1726823 |
| 16 | 67907889 |
| 17 | 1795511707 |
| 18 | 36321261053 |
| 19 | 605440292330 |
| 20 | 8715982350668 |
| 21 | 111865311047525 |
| 22 | 1309224069548063 |
| 23 | 14207107757575607 |
| 24 | 144766250416253170 |
| 25 | 1398869193142980670 |
| 26 | 12919066626921248461 |
| 27 | 114754676548076467734 |
| 28 | 985458803547385212585 |
[72,22702,1726823,67907889,1795511707,36321261053, 605440292330,8715982350668,111865311047525, 1309224069548063,14207107757575607, 144766250416253170,1398869193142980670, 12919066626921248461,114754676548076467734, 985458803547385212585] |