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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 83 |
| 4 | 697 |
| 5 | 1685 |
| 6 | 22521 |
| 7 | 714167 |
| 8 | 6551627 |
| 9 | 273085171 |
| 10 | 6372562445 |
| 11 | 109738148749 |
| 12 | 111017326363 |
| 13 | 6843690854527 |
| 14 | 6909897986791 |
| 15 | 494972427791585 |
| 16 | 9482037783487391 |
| 17 | 85993305141830183 |
| 18 | 3724238207261666261 |
[1,7,83,697,1685,22521,714167,6551627,273085171, 6372562445,109738148749,111017326363, 6843690854527,6909897986791,494972427791585, 9482037783487391,85993305141830183, 3724238207261666261] |