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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 9 |
| 3 | 15 |
| 4 | 16 |
| 5 | 18 |
| 6 | 21 |
| 7 | 22 |
| 8 | 27 |
| 9 | 28 |
| 10 | 30 |
| 11 | 31 |
| 12 | 34 |
| 13 | 35 |
| 14 | 36 |
| 15 | 41 |
| 16 | 44 |
[2,4,9,15,16,18,21,22,27,28,30,31,34,35,36,41,44] |