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| n | a(n) |
|---|---|
| 9 | 1 |
| 10 | 1 |
| 11 | 6 |
| 12 | 18 |
| 13 | 73 |
| 14 | 240 |
| 15 | 841 |
| 16 | 2714 |
| 17 | 8758 |
| 18 | 27259 |
| 19 | 83847 |
| 20 | 252929 |
| 21 | 754737 |
| 22 | 2225129 |
| 23 | 6505344 |
| 24 | 18867696 |
| 25 | 54384446 |
| 26 | 155892016 |
| 27 | 444839696 |
| 28 | 1264336132 |
| 29 | 3581584336 |
| 30 | 10116577962 |
| 31 | 28505061687 |
| 32 | 80146304124 |
| 33 | 224929999040 |
| 34 | 630259883854 |
| 35 | 1763574118096 |
| 36 | 4928881367449 |
[1,1,6,18,73,240,841,2714,8758,27259,83847,252929, 754737,2225129,6505344,18867696,54384446, 155892016,444839696,1264336132,3581584336, 10116577962,28505061687,80146304124,224929999040, 630259883854,1763574118096,4928881367449] |