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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 9 |
| 7 | 11 |
| 8 | 15 |
| 9 | 33 |
| 10 | 38 |
| 11 | 239 |
| 12 | 419 |
| 13 | 441 |
| 14 | 486 |
| 15 | 5127 |
| 16 | 6953 |
| 17 | 6998 |
| 18 | 45609 |
[0,1,2,3,5,9,11,15,33,38,239,419,441,486,5127, 6953,6998,45609] |