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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 15 |
| 6 | 28 |
| 7 | 52 |
| 8 | 99 |
| 9 | 193 |
| 10 | 377 |
| 11 | 739 |
| 12 | 1459 |
| 13 | 2908 |
| 14 | 5799 |
| 15 | 11537 |
| 16 | 23021 |
| 17 | 45971 |
| 18 | 91857 |
| 19 | 183513 |
[1,2,4,8,15,28,52,99,193,377,739,1459,2908,5799, 11537,23021,45971,91857,183513] |