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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 9 |
| 3 | 53 |
| 4 | 231 |
| 5 | 5319 |
| 6 | 3167 |
| 7 | 1296273 |
| 8 | 1604979 |
| 9 | 64370707 |
| 10 | 22906587 |
| 11 | 411169704813 |
| 12 | 610433321 |
| 13 | 424312831956207 |
| 14 | 2146177886409 |
| 15 | 98731231639051 |
| 16 | 12218411169233691 |
| 17 | 1112291237880234922707 |
| 18 | 2196818399875253 |
| 19 | 2619031544578888560315813 |
| 20 | 16827894135040576041 |
[3,9,53,231,5319,3167,1296273,1604979,64370707, 22906587,411169704813,610433321,424312831956207, 2146177886409,98731231639051,12218411169233691, 1112291237880234922707,2196818399875253, 2619031544578888560315813,16827894135040576041] |