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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 7 |
| 8 | 14 |
| 9 | 27 |
| 10 | 52 |
| 11 | 100 |
| 12 | 193 |
| 13 | 372 |
| 14 | 717 |
| 15 | 1382 |
| 16 | 2664 |
| 17 | 5135 |
| 18 | 9898 |
| 19 | 19079 |
| 20 | 36776 |
| 21 | 70888 |
| 22 | 136641 |
| 23 | 263384 |
| 24 | 507689 |
| 25 | 978602 |
| 26 | 1886316 |
| 27 | 3635991 |
| 28 | 7008598 |
| 29 | 13509507 |
| 30 | 26040412 |
| 31 | 50194508 |
| 32 | 96753025 |
| 33 | 186497452 |
| 34 | 359485397 |
| 35 | 692930382 |
| 36 | 1335666256 |
| 37 | 2574579487 |
[0,0,1,0,1,2,4,7,14,27,52,100,193,372,717,1382, 2664,5135,9898,19079,36776,70888,136641,263384, 507689,978602,1886316,3635991,7008598,13509507, 26040412,50194508,96753025,186497452,359485397, 692930382,1335666256,2574579487] |