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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 79 |
| 5 | 641 |
| 6 | 6579 |
| 7 | 81677 |
| 8 | 1187039 |
| 9 | 19728193 |
| 10 | 368562723 |
| 11 | 7639512013 |
| 12 | 173893382575 |
| 13 | 4310656806977 |
| 14 | 115569893763411 |
| 15 | 3331588687405133 |
| 16 | 102751933334045375 |
| 17 | 3375782951798785921 |
| 18 | 117693183724386637635 |
[1,3,13,79,641,6579,81677,1187039,19728193, 368562723,7639512013,173893382575,4310656806977, 115569893763411,3331588687405133, 102751933334045375,3375782951798785921, 117693183724386637635] |