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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 3 |
| 6 | 10 |
| 7 | 12 |
| 8 | 35 |
| 9 | 58 |
| 10 | 160 |
| 11 | 341 |
| 12 | 958 |
| 13 | 2444 |
| 14 | 7242 |
| 15 | 21190 |
| 16 | 67217 |
| 17 | 217335 |
| 18 | 740542 |
| 19 | 2593802 |
| 20 | 9444080 |
| 21 | 35383843 |
[1,3,3,10,12,35,58,160,341,958,2444,7242,21190, 67217,217335,740542,2593802,9444080,35383843] |