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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 4 |
| 3 | 5 |
| 4 | 7 |
| 5 | 12 |
| 6 | 15 |
| 7 | 26 |
| 8 | 31 |
| 9 | 50 |
| 10 | 71 |
| 11 | 186 |
| 12 | 273 |
| 13 | 366 |
| 14 | 1542 |
| 15 | 1929 |
| 16 | 3687 |
| 17 | 4407 |
| 18 | 15395 |
| 19 | 15433 |
[3,4,5,7,12,15,26,31,50,71,186,273,366,1542,1929, 3687,4407,15395,15433] |