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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 17 |
| 4 | 38 |
| 5 | 75 |
| 6 | 161 |
| 7 | 310 |
| 8 | 655 |
| 9 | 1252 |
| 10 | 2633 |
| 11 | 5022 |
| 12 | 10547 |
| 13 | 20104 |
| 14 | 42206 |
| 15 | 80435 |
| 16 | 168844 |
| 17 | 321761 |
| 18 | 675398 |
| 19 | 1287067 |
| 20 | 2701616 |
| 21 | 5148293 |
| 22 | 10806490 |
| 23 | 20593199 |
| 24 | 43225988 |
| 25 | 82372825 |
| 26 | 172903982 |
[1,3,8,17,38,75,161,310,655,1252,2633,5022,10547, 20104,42206,80435,168844,321761,675398,1287067, 2701616,5148293,10806490,20593199,43225988, 82372825,172903982] |