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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 12 |
| 4 | 33 |
| 5 | 95 |
| 6 | 237 |
| 7 | 665 |
| 8 | 1669 |
| 9 | 4765 |
| 10 | 12213 |
| 11 | 35557 |
| 12 | 92693 |
| 13 | 273525 |
| 14 | 720597 |
| 15 | 2143125 |
| 16 | 5679189 |
| 17 | 16962005 |
| 18 | 45087573 |
| 19 | 134958677 |
[3,12,33,95,237,665,1669,4765,12213,35557,92693, 273525,720597,2143125,5679189,16962005,45087573, 134958677] |