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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 11 |
| 3 | 15 |
| 4 | 19 |
| 5 | 31 |
| 6 | 59 |
| 7 | 75 |
| 8 | 103 |
| 9 | 163 |
| 10 | 235 |
| 11 | 375 |
| 12 | 615 |
| 13 | 767 |
| 14 | 1223 |
| 15 | 1411 |
| 16 | 26655 |
| 17 | 47351 |
| 18 | 75027 |
| 19 | 83323 |
| 20 | 121571 |
| 21 | 238163 |
| 22 | 312359 |
| 23 | 359915 |
| 24 | 471455 |
[3,11,15,19,31,59,75,103,163,235,375,615,767,1223, 1411,26655,47351,75027,83323,121571,238163,312359, 359915,471455] |