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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 10 |
| 5 | 15 |
| 6 | 21 |
| 7 | 22 |
| 8 | 25 |
| 9 | 33 |
| 10 | 57 |
| 11 | 58 |
| 12 | 85 |
| 13 | 93 |
| 14 | 133 |
| 15 | 177 |
| 16 | 253 |
[4,6,9,10,15,21,22,25,33,57,58,85,93,133,177,253] |