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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 12 |
| 9 | 30 |
| 10 | 88 |
| 11 | 204 |
| 12 | 392 |
| 13 | 893 |
| 14 | 2185 |
| 15 | 5461 |
| 16 | 14441 |
| 17 | 37158 |
| 18 | 93312 |
| 19 | 236157 |
| 20 | 601599 |
| 21 | 1538005 |
| 22 | 3963519 |
| 23 | 10245493 |
| 24 | 26465121 |
| 25 | 68448150 |
| 26 | 177543974 |
| 27 | 461856724 |
| 28 | 1204741952 |
| 29 | 3150133226 |
| 30 | 8253342526 |
| 31 | 21660871257 |
[1,1,1,1,2,12,30,88,204,392,893,2185,5461,14441, 37158,93312,236157,601599,1538005,3963519, 10245493,26465121,68448150,177543974,461856724, 1204741952,3150133226,8253342526,21660871257] |