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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 9 |
| 6 | 10 |
| 7 | 16 |
| 8 | 124 |
| 9 | 243 |
| 10 | 303 |
| 11 | 459 |
| 12 | 471 |
| 13 | 520 |
| 14 | 591 |
| 15 | 1726 |
| 16 | 2971 |
| 17 | 5560 |
| 18 | 5757 |
| 19 | 13222 |
[1,3,4,7,9,10,16,124,243,303,459,471,520,591,1726, 2971,5560,5757,13222] |