| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 0 |
| 8 | 1 |
| 9 | 1 |
| 10 | 3 |
| 11 | 3 |
| 12 | 12 |
| 13 | 19 |
| 14 | 64 |
| 15 | 155 |
| 16 | 510 |
| 17 | 1514 |
| 18 | 5146 |
| 19 | 16966 |
| 20 | 58782 |
| 21 | 203269 |
| 22 | 716607 |
| 23 | 2536201 |
| 24 | 9062402 |
| 25 | 32533568 |
| 26 | 117498072 |
| 27 | 426212952 |
| 28 | 1553048548 |
| 29 | 5681011890 |
| 30 | 20858998805 |
| 31 | 76850220654 |
| 32 | 284057538480 |
| 33 | 1053134292253 |
| 34 | 3915683667721 |
[1,0,1,1,3,3,12,19,64,155,510,1514,5146,16966, 58782,203269,716607,2536201,9062402,32533568, 117498072,426212952,1553048548,5681011890, 20858998805,76850220654,284057538480, 1053134292253,3915683667721] |