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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 8 |
| 6 | 9 |
| 7 | 17 |
| 8 | 40 |
| 9 | 73 |
| 10 | 117 |
| 11 | 208 |
| 12 | 401 |
| 13 | 737 |
| 14 | 1296 |
| 15 | 2321 |
| 16 | 4261 |
| 17 | 7768 |
| 18 | 13977 |
| 19 | 25201 |
| 20 | 45752 |
| 21 | 83033 |
| 22 | 150165 |
| 23 | 271520 |
| 24 | 491809 |
| 25 | 891073 |
| 26 | 1613088 |
| 27 | 2919457 |
| 28 | 5285957 |
| 29 | 9572264 |
| 30 | 17330985 |
| 31 | 31375313 |
| 32 | 56805448 |
[1,1,0,1,5,8,9,17,40,73,117,208,401,737,1296,2321, 4261,7768,13977,25201,45752,83033,150165,271520, 491809,891073,1613088,2919457,5285957,9572264, 17330985,31375313,56805448] |