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| n | a(n) |
|---|---|
| 9 | 1 |
| 10 | 10 |
| 11 | 55 |
| 12 | 220 |
| 13 | 715 |
| 14 | 2002 |
| 15 | 5005 |
| 16 | 11440 |
| 17 | 24310 |
| 18 | 48620 |
| 19 | 92378 |
| 20 | 167960 |
| 21 | 293930 |
| 22 | 497420 |
| 23 | 817190 |
| 24 | 1307504 |
| 25 | 2042975 |
| 26 | 3124550 |
| 27 | 4686825 |
| 28 | 6906900 |
| 29 | 10015005 |
| 30 | 14307150 |
| 31 | 20160075 |
| 32 | 28048800 |
| 33 | 38567100 |
| 34 | 52451256 |
| 35 | 70607460 |
| 36 | 94143280 |
| 37 | 124403620 |
| 38 | 163011640 |
| 39 | 211915132 |
[1,10,55,220,715,2002,5005,11440,24310,48620, 92378,167960,293930,497420,817190,1307504,2042975, 3124550,4686825,6906900,10015005,14307150, 20160075,28048800,38567100,52451256,70607460, 94143280,124403620,163011640,211915132] |