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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 8 |
| 2 | 10 |
| 3 | 15 |
| 4 | 20 |
| 5 | 28 |
| 6 | 41 |
| 7 | 60 |
| 8 | 90 |
| 9 | 138 |
| 10 | 215 |
| 11 | 339 |
| 12 | 540 |
| 13 | 863 |
| 14 | 1385 |
| 15 | 2229 |
| 16 | 3594 |
| 17 | 5802 |
[3,8,10,15,20,28,41,60,90,138,215,339,540,863, 1385,2229,3594,5802] |