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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 17 |
| 3 | 91 |
| 4 | 321 |
| 5 | 1341 |
| 6 | 5269 |
| 7 | 21379 |
| 8 | 85633 |
| 9 | 344955 |
| 10 | 1386679 |
| 11 | 5579199 |
| 12 | 22440525 |
| 13 | 90271591 |
| 14 | 363117835 |
| 15 | 1460674773 |
| 16 | 5875648527 |
| 17 | 23635221447 |
| 18 | 95074256043 |
| 19 | 382442764281 |
| 20 | 1538402105163 |
| 21 | 6188327969265 |
| 22 | 24892972759953 |
| 23 | 100133687989929 |
[9,17,91,321,1341,5269,21379,85633,344955,1386679, 5579199,22440525,90271591,363117835,1460674773, 5875648527,23635221447,95074256043,382442764281, 1538402105163,6188327969265,24892972759953, 100133687989929] |