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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 16 |
| 5 | 35 |
| 6 | 74 |
| 7 | 152 |
| 8 | 313 |
| 9 | 638 |
| 10 | 1287 |
| 11 | 2597 |
| 12 | 5233 |
| 13 | 10512 |
| 14 | 21077 |
| 15 | 42237 |
| 16 | 84565 |
| 17 | 169285 |
| 18 | 338636 |
| 19 | 677457 |
[1,3,7,16,35,74,152,313,638,1287,2597,5233,10512, 21077,42237,84565,169285,338636,677457] |