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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 21 |
| 5 | 44 |
| 6 | 85 |
| 7 | 156 |
| 8 | 276 |
| 9 | 476 |
| 10 | 806 |
| 11 | 1347 |
| 12 | 2230 |
| 13 | 3667 |
| 14 | 6001 |
| 15 | 9787 |
| 16 | 15923 |
| 17 | 25862 |
| 18 | 41955 |
| 19 | 68006 |
| 20 | 110170 |
| 21 | 178406 |
| 22 | 288828 |
| 23 | 467509 |
| 24 | 756636 |
| 25 | 1224469 |
| 26 | 1981455 |
| 27 | 3206301 |
| 28 | 5188161 |
| 29 | 8394896 |
| 30 | 13583521 |
| 31 | 21978912 |
| 32 | 35562960 |
| 33 | 57542432 |
| 34 | 93105986 |
[0,1,3,9,21,44,85,156,276,476,806,1347,2230,3667, 6001,9787,15923,25862,41955,68006,110170,178406, 288828,467509,756636,1224469,1981455,3206301, 5188161,8394896,13583521,21978912,35562960, 57542432,93105986] |