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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 7 |
| 6 | 19 |
| 7 | 27 |
| 8 | 43 |
| 9 | 55 |
| 10 | 207 |
| 11 | 1311 |
| 12 | 3204 |
| 13 | 7050 |
| 14 | 9439 |
| 15 | 26044 |
| 16 | 33058 |
| 17 | 34507 |
| 18 | 49314 |
| 19 | 119292 |
[0,1,3,6,7,19,27,43,55,207,1311,3204,7050,9439, 26044,33058,34507,49314,119292] |