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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 7 |
| 3 | 17 |
| 4 | 41 |
| 5 | 101 |
| 6 | 239 |
| 7 | 577 |
| 8 | 1393 |
| 9 | 3365 |
| 10 | 8119 |
| 11 | 19601 |
| 12 | 47321 |
| 13 | 114245 |
| 14 | 275807 |
| 15 | 665857 |
| 16 | 1607521 |
| 17 | 3880901 |
| 18 | 9369319 |
| 19 | 22619537 |
| 20 | 54608393 |
| 21 | 131836325 |
| 22 | 318281039 |
| 23 | 768398401 |
| 24 | 1855077841 |
| 25 | 4478554085 |
| 26 | 10812186007 |
| 27 | 26102926097 |
| 28 | 63018038201 |
[1,5,7,17,41,101,239,577,1393,3365,8119,19601, 47321,114245,275807,665857,1607521,3880901, 9369319,22619537,54608393,131836325,318281039, 768398401,1855077841,4478554085,10812186007, 26102926097,63018038201] |