| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 34 |
| 6 | 78 |
| 7 | 182 |
| 8 | 429 |
| 9 | 1019 |
| 10 | 2433 |
| 11 | 5830 |
| 12 | 14004 |
| 13 | 33694 |
| 14 | 81159 |
| 15 | 195635 |
| 16 | 471819 |
| 17 | 1138286 |
| 18 | 2746794 |
| 19 | 6629290 |
| 20 | 16001193 |
| 21 | 38624911 |
| 22 | 93240069 |
| 23 | 225087338 |
| 24 | 543386088 |
| 25 | 1311813146 |
| 26 | 3166937355 |
| 27 | 7645566463 |
| 28 | 18457873863 |
| 29 | 44560996378 |
| 30 | 107579352390 |
| 31 | 259718869118 |
[0,2,3,7,15,34,78,182,429,1019,2433,5830,14004, 33694,81159,195635,471819,1138286,2746794,6629290, 16001193,38624911,93240069,225087338,543386088, 1311813146,3166937355,7645566463,18457873863, 44560996378,107579352390,259718869118] |