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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 21 |
| 3 | 33 |
| 4 | 57 |
| 5 | 185 |
| 6 | 201 |
| 7 | 393 |
| 8 | 1841 |
| 9 | 5753 |
| 10 | 7217 |
| 11 | 10265 |
| 12 | 12297 |
| 13 | 139553 |
| 14 | 607577 |
| 15 | 98313 |
| 16 | 196617 |
| 17 | 3801929 |
| 18 | 786441 |
| 19 | 27790073 |
| 20 | 7340081 |
| 21 | 35651873 |
| 22 | 281022857 |
| 23 | 92274809 |
| 24 | 721422137 |
| 25 | 1375733393 |
| 26 | 6509569217 |
| 27 | 3892314953 |
| 28 | 805306377 |
[15,21,33,57,185,201,393,1841,5753,7217,10265, 12297,139553,607577,98313,196617,3801929,786441, 27790073,7340081,35651873,281022857,92274809, 721422137,1375733393,6509569217,3892314953, 805306377] |