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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 13 |
| 6 | 26 |
| 7 | 59 |
| 8 | 118 |
| 9 | 205 |
| 10 | 410 |
| 11 | 973 |
| 12 | 1946 |
| 13 | 3479 |
| 14 | 6958 |
| 15 | 16882 |
| 16 | 33764 |
| 17 | 61319 |
| 18 | 122638 |
| 19 | 301486 |
| 20 | 602972 |
| 21 | 1105973 |
| 22 | 2211946 |
| 23 | 5485128 |
| 24 | 10970256 |
| 25 | 20259303 |
| 26 | 40518606 |
| 27 | 101097960 |
| 28 | 202195920 |
| 29 | 375265833 |
| 30 | 750531666 |
| 31 | 1881279267 |
[1,1,2,4,8,13,26,59,118,205,410,973,1946,3479, 6958,16882,33764,61319,122638,301486,602972, 1105973,2211946,5485128,10970256,20259303, 40518606,101097960,202195920,375265833,750531666, 1881279267] |