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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 13 |
| 5 | 34 |
| 6 | 85 |
| 7 | 199 |
| 8 | 454 |
| 9 | 1011 |
| 10 | 2220 |
| 11 | 4813 |
| 12 | 10351 |
| 13 | 22104 |
| 14 | 46948 |
| 15 | 99266 |
| 16 | 209113 |
[0,1,4,13,34,85,199,454,1011,2220,4813,10351, 22104,46948,99266,209113] |