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| n | a(n) |
|---|---|
| 9 | 1 |
| 10 | 0 |
| 11 | 10 |
| 12 | 10 |
| 13 | 65 |
| 14 | 120 |
| 15 | 395 |
| 16 | 890 |
| 17 | 2320 |
| 18 | 5401 |
| 19 | 12847 |
| 20 | 29380 |
| 21 | 66735 |
| 22 | 148630 |
| 23 | 327270 |
| 24 | 711247 |
| 25 | 1529020 |
| 26 | 3252775 |
| 27 | 6855276 |
| 28 | 14320645 |
| 29 | 29672905 |
| 30 | 61018010 |
| 31 | 124587120 |
| 32 | 252694835 |
| 33 | 509337682 |
| 34 | 1020610708 |
| 35 | 2033777830 |
| 36 | 4031514561 |
| 37 | 7951981550 |
| 38 | 15611183177 |
| 39 | 30510678865 |
[1,0,10,10,65,120,395,890,2320,5401,12847,29380, 66735,148630,327270,711247,1529020,3252775, 6855276,14320645,29672905,61018010,124587120, 252694835,509337682,1020610708,2033777830, 4031514561,7951981550,15611183177,30510678865] |