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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 20 |
| 6 | 45 |
| 7 | 96 |
| 8 | 201 |
| 9 | 414 |
| 10 | 851 |
| 11 | 1738 |
| 12 | 3531 |
| 13 | 7163 |
| 14 | 14483 |
| 15 | 29255 |
| 16 | 58993 |
| 17 | 118820 |
[1,3,9,20,45,96,201,414,851,1738,3531,7163,14483, 29255,58993,118820] |