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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 49 |
| 4 | 91 |
| 5 | 637 |
| 6 | 1729 |
| 7 | 12103 |
| 8 | 53599 |
| 9 | 375193 |
| 10 | 1983163 |
| 11 | 13882141 |
| 12 | 85276009 |
| 13 | 596932063 |
| 14 | 4178524441 |
| 15 | 5201836549 |
| 16 | 36412855843 |
| 17 | 254889990901 |
| 18 | 348523048783 |
| 19 | 2439661341481 |
| 20 | 17077629390367 |
| 21 | 25442182561159 |
| 22 | 178095277928113 |
| 23 | 1246666945496791 |
| 24 | 2009932422331561 |
| 25 | 14069526956320927 |
[1,7,49,91,637,1729,12103,53599,375193,1983163, 13882141,85276009,596932063,4178524441,5201836549, 36412855843,254889990901,348523048783, 2439661341481,17077629390367,25442182561159, 178095277928113,1246666945496791,2009932422331561, 14069526956320927] |