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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 15 |
| 5 | 16 |
| 6 | 33 |
| 7 | 285 |
| 8 | 867 |
| 9 | 5683 |
| 10 | 14205 |
| 11 | 21075 |
| 12 | 27120 |
| 13 | 31403 |
| 14 | 388601 |
| 15 | 1037577 |
| 16 | 1246064 |
[1,3,9,15,16,33,285,867,5683,14205,21075,27120, 31403,388601,1037577,1246064] |