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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 2 |
| 5 | 5 |
| 6 | 10 |
| 7 | 17 |
| 8 | 38 |
| 9 | 66 |
| 10 | 138 |
| 11 | 257 |
| 12 | 508 |
| 13 | 981 |
| 14 | 1900 |
| 15 | 3702 |
| 16 | 7154 |
| 17 | 13925 |
| 18 | 26966 |
| 19 | 52381 |
| 20 | 101594 |
| 21 | 197150 |
| 22 | 382578 |
| 23 | 742257 |
| 24 | 1440440 |
| 25 | 2794777 |
| 26 | 5423256 |
| 27 | 10522954 |
| 28 | 20418882 |
| 29 | 39620597 |
| 30 | 76879298 |
| 31 | 149176601 |
| 32 | 289460206 |
| 33 | 561667802 |
| 34 | 1089854522 |
| 35 | 2114747217 |
[0,1,0,2,2,5,10,17,38,66,138,257,508,981,1900, 3702,7154,13925,26966,52381,101594,197150,382578, 742257,1440440,2794777,5423256,10522954,20418882, 39620597,76879298,149176601,289460206,561667802, 1089854522,2114747217] |