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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 17 |
| 5 | 35 |
| 6 | 66 |
| 7 | 124 |
| 8 | 229 |
| 9 | 414 |
| 10 | 742 |
| 11 | 1318 |
| 12 | 2320 |
| 13 | 4059 |
| 14 | 7062 |
| 15 | 12224 |
| 16 | 21071 |
| 17 | 36185 |
| 18 | 61930 |
| 19 | 105678 |
| 20 | 179847 |
| 21 | 305326 |
| 22 | 517212 |
| 23 | 874380 |
| 24 | 1475472 |
| 25 | 2485573 |
| 26 | 4180648 |
| 27 | 7021544 |
| 28 | 11777117 |
| 29 | 19728911 |
| 30 | 33011202 |
[0,1,4,8,17,35,66,124,229,414,742,1318,2320,4059, 7062,12224,21071,36185,61930,105678,179847,305326, 517212,874380,1475472,2485573,4180648,7021544, 11777117,19728911,33011202] |