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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 17 |
| 3 | 71 |
| 4 | 449 |
| 5 | 881 |
| 6 | 2591 |
| 7 | 9521 |
| 8 | 39761 |
| 9 | 106721 |
| 10 | 179999 |
| 11 | 206081 |
| 12 | 342791 |
| 13 | 388961 |
| 14 | 596231 |
| 15 | 847601 |
| 16 | 1292831 |
| 17 | 2268449 |
| 18 | 2571911 |
| 19 | 2836961 |
| 20 | 3612671 |
| 21 | 6223391 |
| 22 | 6329681 |
| 23 | 6415361 |
| 24 | 8520191 |
| 25 | 8946449 |
| 26 | 9409121 |
| 27 | 10342151 |
| 28 | 12550049 |
| 29 | 16485281 |
| 30 | 18800711 |
[7,17,71,449,881,2591,9521,39761,106721,179999, 206081,342791,388961,596231,847601,1292831, 2268449,2571911,2836961,3612671,6223391,6329681, 6415361,8520191,8946449,9409121,10342151,12550049, 16485281,18800711] |