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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 23 |
| 3 | 71 |
| 4 | 311 |
| 5 | 479 |
| 6 | 1559 |
| 7 | 5711 |
| 8 | 10559 |
| 9 | 18191 |
| 10 | 31391 |
| 11 | 307271 |
| 12 | 366791 |
| 13 | 366791 |
| 14 | 2155919 |
[7,23,71,311,479,1559,5711,10559,18191,31391, 307271,366791,366791,2155919] |