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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 13 |
| 7 | 25 |
| 8 | 49 |
| 9 | 93 |
| 10 | 181 |
| 11 | 351 |
| 12 | 687 |
| 13 | 1332 |
| 14 | 2591 |
| 15 | 5003 |
| 16 | 9644 |
| 17 | 18462 |
| 18 | 35208 |
| 19 | 66721 |
| 20 | 125840 |
| 21 | 235914 |
| 22 | 440020 |
| 23 | 816122 |
[1,1,1,2,4,7,13,25,49,93,181,351,687,1332,2591, 5003,9644,18462,35208,66721,125840,235914,440020, 816122] |