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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 18 |
| 7 | 38 |
| 8 | 82 |
| 9 | 175 |
| 10 | 373 |
| 11 | 787 |
| 12 | 1651 |
| 13 | 3439 |
| 14 | 7126 |
| 15 | 14667 |
[1,1,1,2,4,8,18,38,82,175,373,787,1651,3439,7126, 14667] |