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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 9 |
| 3 | 15 |
| 4 | 75 |
| 5 | 143 |
| 6 | 425 |
| 7 | 693 |
| 8 | 803 |
| 9 | 903 |
| 10 | 953 |
| 11 | 1079 |
| 12 | 1613 |
| 13 | 1667 |
| 14 | 2937 |
| 15 | 7157 |
| 16 | 7899 |
| 17 | 136767 |
| 18 | 178739 |
| 19 | 191973 |
| 20 | 231927 |
| 21 | 312345 |
| 22 | 315773 |
| 23 | 556077 |
[3,9,15,75,143,425,693,803,903,953,1079,1613,1667, 2937,7157,7899,136767,178739,191973,231927,312345, 315773,556077] |