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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 32 |
| 5 | 69 |
| 6 | 156 |
| 7 | 377 |
| 8 | 855 |
| 9 | 2072 |
| 10 | 5131 |
| 11 | 12922 |
| 12 | 32619 |
| 13 | 83945 |
| 14 | 217305 |
| 15 | 571560 |
| 16 | 1517012 |
| 17 | 4056107 |
[2,6,14,32,69,156,377,855,2072,5131,12922,32619, 83945,217305,571560,1517012,4056107] |