| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 10 |
| 6 | 22 |
| 7 | 43 |
| 8 | 73 |
| 9 | 139 |
| 10 | 268 |
| 11 | 487 |
| 12 | 904 |
| 13 | 1708 |
| 14 | 3169 |
| 15 | 5881 |
| 16 | 11005 |
| 17 | 20512 |
| 18 | 38155 |
| 19 | 71170 |
| 20 | 132706 |
| 21 | 247171 |
| 22 | 460681 |
| 23 | 858799 |
| 24 | 1600312 |
| 25 | 2982355 |
| 26 | 5558752 |
| 27 | 10359688 |
| 28 | 19306753 |
| 29 | 35983009 |
| 30 | 67062073 |
| 31 | 124982332 |
| 32 | 232931359 |
| 33 | 434117578 |
| 34 | 809064574 |
[1,1,1,4,7,10,22,43,73,139,268,487,904,1708,3169, 5881,11005,20512,38155,71170,132706,247171,460681, 858799,1600312,2982355,5558752,10359688,19306753, 35983009,67062073,124982332,232931359,434117578, 809064574] |