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| n | a(n) |
|---|---|
| 1 | 57 |
| 2 | 2291 |
| 3 | 49481 |
| 4 | 989731 |
| 5 | 20749217 |
| 6 | 443724135 |
| 7 | 9461306257 |
| 8 | 201065855279 |
| 9 | 4271553412923 |
| 10 | 90781653057341 |
| 11 | 1929581833121135 |
| 12 | 41012559102622377 |
| 13 | 871687516326898341 |
| 14 | 18526964254094263855 |
| 15 | 393775712485514542969 |
[57,2291,49481,989731,20749217,443724135, 9461306257,201065855279,4271553412923, 90781653057341,1929581833121135,41012559102622377, 871687516326898341,18526964254094263855, 393775712485514542969] |