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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 4 |
| 9 | 8 |
| 10 | 13 |
| 11 | 19 |
| 12 | 38 |
| 13 | 79 |
| 14 | 153 |
| 15 | 273 |
| 16 | 509 |
| 17 | 999 |
| 18 | 1979 |
| 19 | 3818 |
| 20 | 7331 |
| 21 | 14279 |
| 22 | 28189 |
| 23 | 55599 |
| 24 | 109275 |
| 25 | 215165 |
| 26 | 426093 |
| 27 | 846638 |
| 28 | 1683215 |
| 29 | 3348212 |
| 30 | 6673679 |
| 31 | 13333171 |
| 32 | 26679522 |
| 33 | 53437369 |
| 34 | 107151335 |
| 35 | 215154204 |
| 36 | 432586412 |
| 37 | 870678377 |
| 38 | 1754094266 |
[1,0,0,0,1,1,1,1,4,8,13,19,38,79,153,273,509,999, 1979,3818,7331,14279,28189,55599,109275,215165, 426093,846638,1683215,3348212,6673679,13333171, 26679522,53437369,107151335,215154204,432586412, 870678377,1754094266] |