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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 39 |
| 4 | 118 |
| 5 | 313 |
| 6 | 780 |
| 7 | 1789 |
| 8 | 4024 |
| 9 | 8793 |
| 10 | 18760 |
| 11 | 39577 |
| 12 | 82662 |
| 13 | 170677 |
| 14 | 350758 |
| 15 | 717189 |
| 16 | 1458604 |
| 17 | 2959003 |
| 18 | 5987586 |
[1,10,39,118,313,780,1789,4024,8793,18760,39577, 82662,170677,350758,717189,1458604,2959003, 5987586] |