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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 7 |
| 8 | 15 |
| 9 | 27 |
| 10 | 51 |
| 11 | 99 |
| 12 | 199 |
| 13 | 403 |
| 14 | 819 |
| 15 | 1651 |
| 16 | 3303 |
| 17 | 6579 |
| 18 | 13107 |
| 19 | 26163 |
| 20 | 52327 |
| 21 | 104755 |
| 22 | 209715 |
| 23 | 419635 |
| 24 | 839271 |
| 25 | 1678131 |
| 26 | 3355443 |
| 27 | 6710067 |
| 28 | 13420135 |
| 29 | 26841907 |
| 30 | 53687091 |
| 31 | 107377459 |
| 32 | 214754919 |
| 33 | 429503283 |
| 34 | 858993459 |
| 35 | 1717973811 |
| 36 | 3435947623 |
[1,0,0,0,1,1,3,7,15,27,51,99,199,403,819,1651, 3303,6579,13107,26163,52327,104755,209715,419635, 839271,1678131,3355443,6710067,13420135,26841907, 53687091,107377459,214754919,429503283,858993459, 1717973811,3435947623] |