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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 13 |
| 6 | 25 |
| 7 | 51 |
| 8 | 103 |
| 9 | 205 |
| 10 | 409 |
| 11 | 819 |
| 12 | 1639 |
| 13 | 3277 |
| 14 | 6553 |
| 15 | 13107 |
| 16 | 26215 |
| 17 | 52429 |
| 18 | 104857 |
[1,1,1,3,7,13,25,51,103,205,409,819,1639,3277, 6553,13107,26215,52429,104857] |