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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 8 |
| 4 | 9 |
| 5 | 12 |
| 6 | 20 |
| 7 | 24 |
| 8 | 27 |
| 9 | 33 |
| 10 | 49 |
| 11 | 69 |
| 12 | 77 |
| 13 | 145 |
| 14 | 425 |
| 15 | 447 |
| 16 | 567 |
[4,6,8,9,12,20,24,27,33,49,69,77,145,425,447,567] |