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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 15 |
| 4 | 29 |
| 5 | 63 |
| 6 | 199 |
| 7 | 593 |
| 8 | 1657 |
| 9 | 4689 |
| 10 | 13395 |
| 11 | 38357 |
| 12 | 109855 |
| 13 | 313667 |
| 14 | 896417 |
| 15 | 2563517 |
| 16 | 7330205 |
| 17 | 20956899 |
| 18 | 59914557 |
| 19 | 171302635 |
| 20 | 489779503 |
| 21 | 1400327457 |
| 22 | 4003663145 |
| 23 | 11446878297 |
| 24 | 32727841823 |
| 25 | 93572301793 |
| 26 | 267532776375 |
| 27 | 764903730599 |
[1,7,15,29,63,199,593,1657,4689,13395,38357, 109855,313667,896417,2563517,7330205,20956899, 59914557,171302635,489779503,1400327457, 4003663145,11446878297,32727841823,93572301793, 267532776375,764903730599] |