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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 2 |
| 6 | 7 |
| 7 | 8 |
| 8 | 18 |
| 9 | 26 |
| 10 | 55 |
| 11 | 89 |
| 12 | 179 |
| 13 | 308 |
| 14 | 591 |
| 15 | 1086 |
| 16 | 2067 |
| 17 | 3834 |
| 18 | 7315 |
| 19 | 13767 |
| 20 | 26263 |
| 21 | 49884 |
| 22 | 95419 |
| 23 | 182260 |
| 24 | 349712 |
| 25 | 670912 |
| 26 | 1290852 |
| 27 | 2485217 |
| 28 | 4794087 |
| 29 | 9255772 |
| 30 | 17896831 |
| 31 | 34635738 |
| 32 | 67110875 |
| 33 | 130148520 |
| 34 | 252648981 |
| 35 | 490849470 |
[1,0,1,1,3,2,7,8,18,26,55,89,179,308,591,1086, 2067,3834,7315,13767,26263,49884,95419,182260, 349712,670912,1290852,2485217,4794087,9255772, 17896831,34635738,67110875,130148520,252648981, 490849470] |