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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 21 |
| 3 | 65 |
| 4 | 337 |
| 5 | 1185 |
| 6 | 5073 |
| 7 | 20177 |
| 8 | 82617 |
| 9 | 329329 |
| 10 | 1324609 |
| 11 | 5310393 |
| 12 | 21308489 |
| 13 | 85371393 |
| 14 | 341750409 |
| 15 | 1367530569 |
[1,5,21,65,337,1185,5073,20177,82617,329329, 1324609,5310393,21308489,85371393,341750409, 1367530569] |