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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 55 |
| 4 | 1177 |
| 5 | 3553 |
| 6 | 9517 |
| 7 | 11799 |
| 8 | 13579 |
| 9 | 17935 |
| 10 | 31753 |
| 11 | 71995 |
| 12 | 93799 |
| 13 | 97713 |
| 14 | 117397 |
| 15 | 135373 |
| 16 | 371911 |
| 17 | 377719 |
| 18 | 599515 |
| 19 | 733597 |
| 20 | 777573 |
| 21 | 1131313 |
| 22 | 1331155 |
| 23 | 1371591 |
| 24 | 1555119 |
| 25 | 3391315 |
| 26 | 3731377 |
| 27 | 3979717 |
| 28 | 5131573 |
| 29 | 7137715 |
| 30 | 7333353 |
| 31 | 9193933 |
| 32 | 13755771 |
| 33 | 13979515 |
[1,7,55,1177,3553,9517,11799,13579,17935,31753, 71995,93799,97713,117397,135373,371911,377719, 599515,733597,777573,1131313,1331155,1371591, 1555119,3391315,3731377,3979717,5131573,7137715, 7333353,9193933,13755771,13979515] |