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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 3 |
| 10 | 9 |
| 11 | 24 |
| 12 | 62 |
| 13 | 159 |
| 14 | 381 |
| 15 | 927 |
| 16 | 2150 |
| 17 | 5051 |
| 18 | 11483 |
| 19 | 26332 |
| 20 | 58986 |
| 21 | 132796 |
| 22 | 294046 |
| 23 | 652772 |
| 24 | 1431813 |
| 25 | 3143879 |
| 26 | 6841673 |
[1,3,9,24,62,159,381,927,2150,5051,11483,26332, 58986,132796,294046,652772,1431813,3143879, 6841673] |