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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 6 |
| 8 | 14 |
| 9 | 29 |
| 10 | 68 |
| 11 | 147 |
| 12 | 337 |
| 13 | 757 |
| 14 | 1734 |
| 15 | 3953 |
| 16 | 9113 |
| 17 | 20988 |
| 18 | 48645 |
| 19 | 112909 |
| 20 | 263084 |
| 21 | 614201 |
| 22 | 1438001 |
| 23 | 3373253 |
| 24 | 7930660 |
| 25 | 18679005 |
| 26 | 44075988 |
| 27 | 104173194 |
| 28 | 246604137 |
| 29 | 584620470 |
| 30 | 1387879434 |
| 31 | 3299067379 |
| 32 | 7851736348 |
| 33 | 18708682855 |
| 34 | 44627133541 |
[0,0,0,0,1,1,3,6,14,29,68,147,337,757,1734,3953, 9113,20988,48645,112909,263084,614201,1438001, 3373253,7930660,18679005,44075988,104173194, 246604137,584620470,1387879434,3299067379, 7851736348,18708682855,44627133541] |