| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 4 |
| 9 | 6 |
| 10 | 12 |
| 11 | 20 |
| 12 | 35 |
| 13 | 63 |
| 14 | 108 |
| 15 | 192 |
| 16 | 336 |
| 17 | 588 |
| 18 | 1036 |
| 19 | 1813 |
| 20 | 3185 |
| 21 | 5590 |
| 22 | 9804 |
| 23 | 17214 |
| 24 | 30200 |
| 25 | 53000 |
| 26 | 93015 |
| 27 | 163215 |
| 28 | 286440 |
| 29 | 502656 |
| 30 | 882096 |
| 31 | 1547992 |
| 32 | 2716504 |
| 33 | 4767161 |
| 34 | 8365777 |
| 35 | 14680890 |
| 36 | 25763220 |
| 37 | 45211238 |
| 38 | 79340228 |
| 39 | 139232412 |
| 40 | 244335771 |
[0,0,0,0,0,1,1,2,4,6,12,20,35,63,108,192,336,588, 1036,1813,3185,5590,9804,17214,30200,53000,93015, 163215,286440,502656,882096,1547992,2716504, 4767161,8365777,14680890,25763220,45211238, 79340228,139232412,244335771] |